/*	HyperText Tranfer Protocol	- Client implementation 	HTTP.c
**	==========================
** Modified:
** 27 Jan 1994	PDM  Added Ari Luotonen's Fix for Reload when using proxy
**		     servers.
** 28 Apr 1997	AJL,FM Do Proxy Authorisation.
*/

#include <HTUtils.h>
#include <HTTP.h>
#include <LYUtils.h>

#define HTTP_VERSION	"HTTP/1.0"

#define HTTP_PORT   80
#define HTTPS_PORT  443
#define SNEWS_PORT  563

#define INIT_LINE_SIZE		1024	/* Start with line buffer this big */
#define LINE_EXTEND_THRESH	256	/* Minimum read size */
#define VERSION_LENGTH		20	/* for returned protocol version */

#include <HTParse.h>
#include <HTTCP.h>
#include <HTFormat.h>
#include <HTFile.h>
#include <HTAlert.h>
#include <HTMIME.h>
#include <HTML.h>
#include <HTInit.h>
#include <HTAABrow.h>

#include <LYCookie.h>
#include <LYGlobalDefs.h>
#include <GridText.h>
#include <LYStrings.h>
#include <LYLeaks.h>

struct _HTStream
{
  HTStreamClass * isa;
};

extern char * HTAppName;	/* Application name: please supply */
extern char * HTAppVersion;	/* Application version: please supply */
extern char * personal_mail_address;	/* User's name/email address */
extern char * LYUserAgent;	/* Lynx User-Agent string */
extern BOOL LYNoRefererHeader;	/* Never send Referer header? */
extern BOOL LYNoRefererForThis; /* No Referer header for this URL? */
extern BOOL LYNoFromHeader;	/* Never send From header? */
extern BOOL LYSetCookies;	/* Act on Set-Cookie headers? */

extern BOOL using_proxy;	/* Are we using an HTTP gateway? */
PUBLIC BOOL reloading = FALSE;	/* Reloading => send no-cache pragma to proxy */
PUBLIC char * redirecting_url = NULL;	    /* Location: value. */
PUBLIC BOOL permanent_redirection = FALSE;  /* Got 301 status? */
PUBLIC BOOL redirect_post_content = FALSE;  /* Don't convert to GET? */

extern char LYUserSpecifiedURL; /* Is the URL a goto? */

extern BOOL keep_mime_headers;	 /* Include mime headers and force source dump */
extern BOOL no_url_redirection;  /* Don't follow Location: URL for */
extern char *http_error_file;	 /* Store HTTP status code in this file */
extern BOOL traversal;		 /* TRUE if we are doing a traversal */
extern BOOL dump_output_immediately;  /* TRUE if no interactive user */

#define HTTP_NETREAD(a, b, c, d)   NETREAD(a, b, c)
#define HTTP_NETWRITE(a, b, c, d)  NETWRITE(a, b, c)
#define HTTP_NETCLOSE(a, b)  (void)NETCLOSE(a)


/*		Load Document from HTTP Server			HTLoadHTTP()
**		==============================
**
**	Given a hypertext address, this routine loads a document.
**
**
**  On entry,
**	arg	is the hypertext reference of the article to be loaded.
**
**  On exit,
**	returns >=0	If no error, a good socket number
**		<0	Error.
**
**	The socket must be closed by the caller after the document has been
**	read.
**
*/
PRIVATE int HTLoadHTTP ARGS4 (
	CONST char *,		arg,
	HTParentAnchor *,	anAnchor,
	HTFormat,		format_out,
	HTStream*,		sink)
{
  int s;			/* Socket number for returned data */
  CONST char *url = arg;	/* The URL which get_physical() returned */
  char *command = NULL; 	/* The whole command */
  char *eol;			/* End of line if found */
  char *start_of_data;		/* Start of body of reply */
  int status;			/* tcp return */
  int bytes_already_read;
  char crlf[3]; 		/* A CR LF equivalent string */
  HTStream *target;		/* Unconverted data */
  HTFormat format_in;		/* Format arriving in the message */
  BOOL do_head = FALSE; 	/* Whether or not we should do a head */
  BOOL do_post = FALSE; 	/* ARE WE posting ? */
  char *METHOD;

  BOOL had_header;		/* Have we had at least one header? */
  char *line_buffer;
  char *line_kept_clean;
  BOOL extensions;		/* Assume good HTTP server */
  char line[INIT_LINE_SIZE];
  char temp[80];
  BOOL first_Accept = TRUE;
  BOOL show_401 = FALSE;
  BOOL show_407 = FALSE;
  BOOL auth_proxy = NO; 	/* Generate a proxy authorization. - AJL */

  int length, rv;
  BOOL doing_redirect, already_retrying = FALSE, bad_location = FALSE;
  int len = 0;

  void * handle = NULL;

  if (anAnchor->isHEAD)
      do_head = TRUE;
  else if (anAnchor->post_data)
      do_post = TRUE;

  if (!url) {
      status = -3;
      _HTProgress ("Bad request.");
      goto done;
  }
  if (!*url) {
      status = -2;
      _HTProgress ("Bad request.");
      goto done;
  }

  sprintf(crlf, "%c%c", CR, LF);

  /*
  **  At this point, we're talking HTTP/1.0.
  */
  extensions = YES;

try_again:
  /*
  **  All initializations are moved down here from up above,
  **  so we can start over here...
  */
  eol = 0;
  had_header = NO;
  length = 0;
  doing_redirect = FALSE;
  permanent_redirection = FALSE;
  redirect_post_content = FALSE;
  target = NULL;
  line_buffer = NULL;
  line_kept_clean = NULL;

  if (!strncmp(url, "https", 5))
    {
      HTAlert("This client does not contain support for HTTPS URLs.");
      status = HT_NOT_LOADED;
      goto done;
    }
  status = HTDoConnect (arg, "HTTP", HTTP_PORT, &s);
  if (status == HT_INTERRUPTED) {
      /*
      **  Interrupt cleanly.
      */
       CTRACE (tfp, "HTTP: Interrupted on connect; recovering cleanly.\n");
       _HTProgress ("Connection interrupted.");
       status = HT_NOT_LOADED;
       goto done;
   }
   if (status < 0) {
	CTRACE(tfp, "HTTP: Unable to connect to remote host for `%s' (errno = %d).\n",
	    url, SOCKET_ERRNO);
      HTAlert("Unable to connect to remote host.");
      status = HT_NOT_LOADED;
      goto done;
  }

  /*	Ask that node for the document,
  **	omitting the host name & anchor
  */
  {
    char * p1 = (HTParse(url, "", PARSE_PATH|PARSE_PUNCTUATION));

    if (do_post) {
	METHOD = "POST";
	StrAllocCopy(command, "POST ");
    } else if (do_head) {
	METHOD = "HEAD";
	StrAllocCopy(command, "HEAD ");
    } else {
	METHOD = "GET";
	StrAllocCopy(command, "GET ");
    }

    /*
    **	If we are using a proxy gateway don't copy in the first slash
    **	of say: /gopher://a;lkdjfl;ajdf;lkj/;aldk/adflj
    **	so that just gopher://.... is sent.
    */
    if (using_proxy)
	StrAllocCat(command, p1+1);
    else
	StrAllocCat(command, p1);
    FREE(p1);
  }
  if (extensions) {
      StrAllocCat(command, " ");
      StrAllocCat(command, HTTP_VERSION);
  }

  StrAllocCat(command, crlf);	/* CR LF, as in rfc 977 */

  if (extensions) {
      int n, i;
      char * host = NULL;

      if ((host = HTParse(anAnchor->address, "", PARSE_HOST)) != NULL) {
	  sprintf(line, "Host: %s%c%c", host, CR,LF);
	  StrAllocCat(command, line);
	  FREE(host);
      }

      if (!HTPresentations)
	  HTFormatInit();
      n = HTList_count(HTPresentations);

      first_Accept = TRUE;
      len = 0;
      for (i = 0; i < n; i++) {
	  HTPresentation *pres =
			(HTPresentation *)HTList_objectAt(HTPresentations, i);
	  if (pres->rep_out == WWW_PRESENT) {
	      if (pres->rep != WWW_SOURCE &&
		  strcasecomp(HTAtom_name(pres->rep), "www/mime") &&
		  strcasecomp(HTAtom_name(pres->rep), "www/compressed") &&
		  pres->quality <= 1.0 && pres->quality >= 0.0) {
		  if (pres->quality < 1.0) {
		      if (pres->maxbytes > 0) {
			  sprintf(temp, ";q=%4.3f;mxb=%ld",
					pres->quality, pres->maxbytes);
		      } else {
			  sprintf(temp, ";q=%4.3f", pres->quality);
		      }
		  } else if (pres->maxbytes > 0) {
		      sprintf(temp, ";mxb=%ld", pres->maxbytes);
		  } else {
		      temp[0] = '\0';
		  }
		  sprintf(line, "%s%s%s",
				(first_Accept ?
				   "Accept: " : ", "),
				HTAtom_name(pres->rep),
				temp);
		  len += strlen(line);
		  if (len > 252 && !first_Accept) {
		      StrAllocCat(command, crlf);
		      sprintf(line, "Accept: %s%s",
				    HTAtom_name(pres->rep),
				    temp);
		      len = strlen(line);
		  }
		  StrAllocCat(command, line);
		  first_Accept = FALSE;
	      }
	  }
      }
      sprintf(line, "%s*/*;q=0.01%c%c",
		    (first_Accept ?
		       "Accept: " : ", "), CR, LF);
      StrAllocCat(command, line);
      first_Accept = FALSE;
      len = 0;

      sprintf(line, "Accept-Encoding: %s, %s%c%c",
		    "gzip", "compress", CR, LF);
      StrAllocCat(command, line);

      if (language && *language) {
	  sprintf(line, "Accept-Language: %s%c%c", language, CR, LF);
	  StrAllocCat(command, line);
      }

      if (pref_charset && *pref_charset) {
	  StrAllocCat(command, "Accept-Charset: ");
	  strcpy(line, pref_charset);
	  if (line[strlen(line)-1] == ',')
	      line[strlen(line)-1] = '\0';
	  LYLowerCase(line);
	  if (strstr(line, "iso-8859-1") == NULL)
	      strcat(line, ", iso-8859-1;q=0.01");
	  if (strstr(line, "us-ascii") == NULL)
	      strcat(line, ", us-ascii;q=0.01");
	  StrAllocCat(command, line);
	  sprintf(line, "%c%c", CR, LF);
	  StrAllocCat(command, line);
      }

      /*
      **  Promote 300 (Multiple Choices) replies, if supported,
      **  over 406 (Not Acceptable) replies. - FM
      */
      if (!do_post) {
	  sprintf(line, "Negotiate: trans%c%c", CR, LF);
	  StrAllocCat(command, line);
      }

      /*
      **  When reloading give no-cache pragma to proxy server to make
      **  it refresh its cache. -- Ari L. <luotonen@dxcern.cern.ch>
      **
      **  Also send it as a Cache-Control header for HTTP/1.1. - FM
      */
      if (reloading) {
	  sprintf(line, "Pragma: no-cache%c%c", CR, LF);
	  StrAllocCat(command, line);
	  sprintf(line, "Cache-Control: no-cache%c%c", CR, LF);
	  StrAllocCat(command, line);
      }

      if (LYUserAgent && *LYUserAgent) {
	  sprintf(line, "User-Agent: %s%c%c", LYUserAgent, CR, LF);
      } else {
	  sprintf(line, "User-Agent: %s/%s  libwww-FM/%s%c%c",
		  HTAppName ? HTAppName : "unknown",
		  HTAppVersion ? HTAppVersion : "0.0",
		  HTLibraryVersion, CR, LF);
      }
      StrAllocCat(command, line);

      if (personal_mail_address && !LYNoFromHeader) {
	  sprintf(line, "From: %s%c%c", personal_mail_address, CR,LF);
	  StrAllocCat(command, line);
      }

      if (!(LYUserSpecifiedURL ||
	    LYNoRefererHeader || LYNoRefererForThis) &&
	  strcmp(HTLoadedDocumentURL(), "")) {
	  char *cp = HTLoadedDocumentURL();
	  StrAllocCat(command, "Referer: ");
	  if (!strncasecomp(cp, "LYNXIMGMAP:", 11)) {
	      char *cp1 = strchr(cp, '#');
	      if (cp1)
		  *cp1 = '\0';
	      StrAllocCat(command, cp + 11);
	      if (cp1)
		  *cp1 = '#';
	  } else {
	      StrAllocCat(command, cp);
	  }
	  sprintf(line, "%c%c", CR, LF);
	  StrAllocCat(command, line);
      }

      {
	char *abspath;
	char *docname;
	char *hostname;
	char *colon;
	int portnumber;
	char *auth, *cookie = NULL;
	BOOL secure = (strncmp(anAnchor->address, "https", 5) ?
							FALSE : TRUE);

	abspath = HTParse(arg, "", PARSE_PATH|PARSE_PUNCTUATION);
	docname = HTParse(arg, "", PARSE_PATH);
	hostname = HTParse(arg, "", PARSE_HOST);
	if (hostname &&
	    NULL != (colon = strchr(hostname, ':'))) {
	    *(colon++) = '\0';	/* Chop off port number */
	    portnumber = atoi(colon);
	} else if (!strncmp(arg, "https", 5)) {
	    portnumber = HTTPS_PORT;
	} else	{
	    portnumber = HTTP_PORT;
	}

	/*
	**  Add Authorization, Proxy-Authorization,
	**  and/or Cookie headers, if applicable.
	*/
	if (using_proxy) {
	    /*
	    **	If we are using a proxy, first determine if
	    **	we should include an Authorization header
	    **	and/or Cookie header for the ultimate target
	    **	of this request. - FM & AJL
	    */
	    char *host2 = NULL, *path2 = NULL;
	    int port2 = (strncmp(docname, "https", 5) ?
					   HTTP_PORT : HTTPS_PORT);
	    host2 = HTParse(docname, "", PARSE_HOST);
	    path2 = HTParse(docname, "", PARSE_PATH|PARSE_PUNCTUATION);
	    if (host2) {
		if ((colon = strchr(host2, ':')) != NULL) {
		    /* Use non-default port number */
		    *colon = '\0';
		    colon++;
		    port2 = atoi(colon);
		}
	    }
	    /*
	    **	This composeAuth() does file access, i.e., for
	    **	the ultimate target of the request. - AJL
	    */
	    auth_proxy = NO;
	    if ((auth = HTAA_composeAuth(host2, port2, path2,
					 auth_proxy)) != NULL &&
		*auth != '\0') {
		/*
		**  If auth is not NULL nor zero-length, it's
		**  an Authorization header to be included. - FM
		*/
		sprintf(line, "%s%c%c", auth, CR, LF);
		StrAllocCat(command, line);
		CTRACE(tfp, "HTTP: Sending authorization: %s\n", auth);
	    } else if (auth && *auth == '\0') {
		/*
		**  If auth is a zero-length string, the user either
		**  cancelled or goofed at the username and password
		**  prompt. - FM
		*/
		if (!(traversal || dump_output_immediately) &&
			HTConfirm(
			    "Proceed without a username and password?")) {
		    show_401 = TRUE;
		} else {
		    if (traversal || dump_output_immediately)
			HTAlert(
			    "Can't proceed without a username and password.");
		    FREE(command);
		    FREE(hostname);
		    FREE(docname);
		    FREE(host2);
		    FREE(path2);
		    status = HT_NOT_LOADED;
		    goto done;
		}
	    } else {
		CTRACE(tfp, "HTTP: Not sending authorization (yet).\n");
	    }
	    /*
	    **	Add 'Cookie:' header, if it's HTTP or HTTPS
	    **	document being proxied.
	    */
	    if (!strncmp(docname, "http", 4)) {
		cookie = LYCookie(host2, path2, port2, secure);
	    }
	    FREE(host2);
	    FREE(path2);
	    /*
	    **	The next composeAuth() will be for the proxy. - AJL
	    */
	    auth_proxy = YES;
	} else {
	    /*
	    **	Add cookie for a non-proxied request. - FM
	    */
	    cookie = LYCookie(hostname, abspath, portnumber, secure);
	    auth_proxy = NO;
	}
	/*
	**  If we do have a cookie set, add it to the request buffer. - FM
	*/
	if (cookie != NULL) {
	    if (*cookie != '$') {
		/*
		**  It's a historical cookie, so signal to the
		**  server that we support modern cookies. - FM
		*/
		StrAllocCat(command, "Cookie2: $Version=\"1\"");
		StrAllocCat(command, crlf);
		CTRACE(tfp, "HTTP: Sending Cookie2: $Version =\"1\"\n");
	    }
	    if (*cookie != '\0') {
		/*
		**  It's not a zero-length string, so add the header.
		**  Note that any folding of long strings has been
		**  done already in LYCookie.c. - FM
		*/
		StrAllocCat(command, "Cookie: ");
		StrAllocCat(command, cookie);
		StrAllocCat(command, crlf);
		CTRACE(tfp, "HTTP: Sending Cookie: %s\n", cookie);
	    }
	    FREE(cookie);
	}
	FREE(abspath);

	/*
	**  If we are using a proxy, auth_proxy should be YES, and
	**  we check here whether we want a Proxy-Authorization header
	**  for it.  If we are not using a proxy, auth_proxy should
	**  still be NO, and we check here for whether we want an
	**  Authorization header. - FM & AJL
	*/
	if ((auth = HTAA_composeAuth(hostname,
				     portnumber,
				     docname,
				     auth_proxy)) != NULL &&
	    *auth != '\0') {
	    /*
	    **	If auth is not NULL nor zero-length, it's
	    **	an Authorization or Proxy-Authorization
	    **	header to be included. - FM
	    */
	    sprintf(line, "%s%c%c", auth, CR, LF);
	    StrAllocCat(command, line);
	    CTRACE(tfp, (auth_proxy ?
			 "HTTP: Sending proxy authorization: %s\n" :
			 "HTTP: Sending authorization: %s\n"),
			auth);
	} else if (auth && *auth == '\0') {
	    /*
	    **	If auth is a zero-length string, the user either
	    **	cancelled or goofed at the username and password
	    **	prompt. - FM
	    */
	    if (!(traversal || dump_output_immediately) &&
		HTConfirm("Proceed without a username and password?")) {
		if (auth_proxy == TRUE) {
		    show_407 = TRUE;
		} else {
		    show_401 = TRUE;
		}
	    } else {
		if (traversal || dump_output_immediately)
		    HTAlert("Can't proceed without a username and password.");
		FREE(command);
		FREE(hostname);
		FREE(docname);
		status = HT_NOT_LOADED;
		goto done;
	    }
	} else {
	    CTRACE(tfp, (auth_proxy ?
			 "HTTP: Not sending proxy authorization (yet).\n" :
			 "HTTP: Not sending authorization (yet).\n"));
	}
	FREE(hostname);
	FREE(docname);
      }
      auth_proxy = NO;
  }

    if (do_post) {
	CTRACE (tfp, "HTTP: Doing post, content-type '%s'\n",
		     anAnchor->post_content_type ? anAnchor->post_content_type
						 : "lose");
      sprintf (line, "Content-type: %s%c%c",
	       anAnchor->post_content_type ? anAnchor->post_content_type
					   : "lose", CR, LF);
      StrAllocCat(command, line);
      {
	int content_length;
	if (!anAnchor->post_data)
	  content_length = 0;
	else
	  content_length = strlen (anAnchor->post_data);
	sprintf (line, "Content-length: %d%c%c",
		 content_length, CR, LF);
	StrAllocCat(command, line);
      }

      StrAllocCat(command, crlf);	/* Blank line means "end" of headers */

      StrAllocCat(command, anAnchor->post_data);
    }
  else
      StrAllocCat(command, crlf);	/* Blank line means "end" of headers */

  CTRACE (tfp, "Writing:\n%s%s----------------------------------\n",
	       command,
	       (anAnchor->post_data ? crlf : ""));

  _HTProgress ("Sending HTTP request.");

  status = HTTP_NETWRITE(s, command, (int)strlen(command), handle);
  FREE(command);
  if (status <= 0) {
      if (status == 0) {
	  CTRACE (tfp, "HTTP: Got status 0 in initial write\n");
	  /* Do nothing. */
      } else if ((SOCKET_ERRNO == ENOTCONN ||
		  SOCKET_ERRNO == ECONNRESET ||
		  SOCKET_ERRNO == EPIPE) &&
		 !already_retrying &&
		 /* Don't retry if we're posting. */ !do_post) {
	    /*
	    **	Arrrrgh, HTTP 0/1 compability problem, maybe.
	    */
	    CTRACE (tfp, "HTTP: BONZO ON WRITE Trying again with HTTP0 request.\n");
	    _HTProgress ("Retrying as HTTP0 request.");
	    HTTP_NETCLOSE(s, handle);
	    extensions = NO;
	    already_retrying = TRUE;
	    goto try_again;
      } else {
	  CTRACE (tfp, "HTTP: Hit unexpected network WRITE error; aborting connection.\n");
	  HTTP_NETCLOSE(s, handle);
	  status = -1;
	  HTAlert("Unexpected network write error; connection aborted.");
	  goto done;
      }
  }

  CTRACE (tfp, "HTTP: WRITE delivered OK\n");
  _HTProgress ("HTTP request sent; waiting for response.");

  /*	Read the first line of the response
  **	-----------------------------------
  */
  {
    /* Get numeric status etc */
    BOOL end_of_file = NO;
    int buffer_length = INIT_LINE_SIZE;

    line_buffer = (char *)calloc(1, (buffer_length * sizeof(char)));

    HTReadProgress (bytes_already_read = 0, 0);
    do {/* Loop to read in the first line */
	/*
	**  Extend line buffer if necessary for those crazy WAIS URLs ;-)
	*/
	if (buffer_length - length < LINE_EXTEND_THRESH) {
	    buffer_length = buffer_length + buffer_length;
	    line_buffer =
	      (char *)realloc(line_buffer, (buffer_length * sizeof(char)));
	}
	CTRACE (tfp, "HTTP: Trying to read %d\n",
		     buffer_length - length - 1);
	status = HTTP_NETREAD(s, line_buffer + length,
			      buffer_length - length - 1, handle);
	CTRACE (tfp, "HTTP: Read %d\n", status);
	if (status <= 0) {
	    /*
	     *	Retry if we get nothing back too.
	     *	Bomb out if we get nothing twice.
	     */
	    if (status == HT_INTERRUPTED) {
		CTRACE (tfp, "HTTP: Interrupted initial read.\n");
		_HTProgress ("Connection interrupted.");
		HTTP_NETCLOSE(s, handle);
		status = HT_NO_DATA;
		goto clean_up;
	    } else if  (status < 0 &&
			(SOCKET_ERRNO == ENOTCONN ||
			 SOCKET_ERRNO == ECONNRESET ||
			 SOCKET_ERRNO == EPIPE) &&
			!already_retrying && !do_post) {
		/*
		**  Arrrrgh, HTTP 0/1 compability problem, maybe.
		*/
		CTRACE (tfp, "HTTP: BONZO Trying again with HTTP0 request.\n");
		HTTP_NETCLOSE(s, handle);
		FREE(line_buffer);
		FREE(line_kept_clean);

		extensions = NO;
		already_retrying = TRUE;
		_HTProgress ("Retrying as HTTP0 request.");
		goto try_again;
	    } else {
		CTRACE (tfp, "HTTP: Hit unexpected network read error; aborting connection; status %d.\n",
			   status);
		HTAlert("Unexpected network read error; connection aborted.");
		HTTP_NETCLOSE(s, handle);
		status = -1;
		goto clean_up;
	    }
	}

	bytes_already_read += status;
	HTReadProgress (bytes_already_read, 0);

#ifdef UCX  /* UCX returns -1 on EOF */
	if (status == 0 || status == -1)
#else
	if (status == 0)
#endif
	{
	    end_of_file = YES;
	    break;
	}
	line_buffer[length+status] = 0;

	if (line_buffer) {
	    FREE(line_kept_clean);
	    line_kept_clean = (char *)malloc(buffer_length * sizeof(char));
	    memcpy(line_kept_clean, line_buffer, buffer_length);
	}

	eol = strchr(line_buffer + length, LF);
	/* Do we *really* want to do this? */
	if (eol && eol != line_buffer && *(eol-1) == CR)
	    *(eol-1) = ' ';

	length = length + status;

	/* Do we really want to do *this*? */
	if (eol)
	    *eol = 0;		/* Terminate the line */
    }
    /*	All we need is the first line of the response.	If it's a HTTP/1.0
    **	response, then the first line will be absurdly short and therefore
    **	we can safely gate the number of bytes read through this code
    **	(as opposed to below) to ~1000.
    **
    **	Well, let's try 100.
    */
    while (!eol && !end_of_file && bytes_already_read < 100);
  } /* Scope of loop variables */


  /*	We now have a terminated unfolded line. Parse it.
  **	-------------------------------------------------
  */
  CTRACE(tfp, "HTTP: Rx: %s\n", line_buffer);

  /*
  **  Kludge to work with old buggy servers and the VMS Help gateway.
  **  They can't handle the third word, so we try again without it.
  */
  if (extensions &&	  /* Old buggy server or Help gateway? */
      (0==strncmp(line_buffer,"<TITLE>Bad File Request</TITLE>",31) ||
       0==strncmp(line_buffer,"Address should begin with",25) ||
       0==strncmp(line_buffer,"<TITLE>Help ",12) ||
       0==strcmp(line_buffer,
		 "Document address invalid or access not authorised"))) {
      FREE(line_buffer);
      FREE(line_kept_clean);
      extensions = NO;
      already_retrying = TRUE;
      CTRACE(tfp, "HTTP: close socket %d to retry with HTTP0\n", s);
      HTTP_NETCLOSE(s, handle);
      /* print a progress message */
      _HTProgress ("Retrying as HTTP0 request.");
      goto try_again;
  }


  {
    int fields;
    char server_version[VERSION_LENGTH+1];
    int server_status;

    server_version[0] = 0;

    fields = sscanf(line_buffer, "%20s %d",
		    server_version,
		    &server_status);

    CTRACE (tfp, "HTTP: Scanned %d fields from line_buffer\n", fields);

    if (http_error_file) {     /* Make the status code externally available */
	FILE *error_file;
#ifdef SERVER_STATUS_ONLY
	error_file = fopen(http_error_file, "w");
	if (error_file) {		/* Managed to open the file */
	    fprintf(error_file, "error=%d\n", server_status);
	    fclose(error_file);
	}
#else
	error_file = fopen(http_error_file, "a");
	if (error_file) {		/* Managed to open the file */
	    fprintf(error_file, "   URL=%s (%s)\n", url, METHOD);
	    fprintf(error_file, "STATUS=%s\n", line_buffer);
	    fclose(error_file);
	}
#endif /* SERVER_STATUS_ONLY */
    }

    /*
    **	Rule out a non-HTTP/1.n reply as best we can.
    */
    if (fields < 2 || !server_version[0] || server_version[0] != 'H' ||
	server_version[1] != 'T' || server_version[2] != 'T' ||
	server_version[3] != 'P' || server_version[4] != '/' ||
	server_version[6] != '.') {
	/*
	 *  Ugh! An HTTP0 reply,
	 */
	HTAtom * encoding;

	CTRACE (tfp, "--- Talking HTTP0.\n");

	format_in = HTFileFormat(url, &encoding, NULL);
	/*
	**  Treat all plain text as HTML.
	**  This sucks but its the only solution without
	**  without looking at content.
	*/
	if (!strncmp(HTAtom_name(format_in), "text/plain",10)) {
	    CTRACE(tfp, "HTTP: format_in being changed to text/HTML\n");
	    format_in = WWW_HTML;
	}
	if (!IsUnityEnc(encoding)) {
	    /*
	    **	Change the format to that for "www/compressed".
	    */
	    CTRACE(tfp, "HTTP: format_in is '%s',\n", HTAtom_name(format_in));
	    StrAllocCopy(anAnchor->content_type, HTAtom_name(format_in));
	    StrAllocCopy(anAnchor->content_encoding, HTAtom_name(encoding));
	    format_in = HTAtom_for("www/compressed");
	    CTRACE(tfp, "        Treating as '%s' with encoding '%s'\n",
			"www/compressed", HTAtom_name(encoding));
	}

	start_of_data = line_kept_clean;
    } else {
	/*
	**  Set up to decode full HTTP/1.n response. - FM
	*/
	format_in = HTAtom_for("www/mime");
	CTRACE (tfp, "--- Talking HTTP1.\n");

	/*
	**  We set start_of_data to "" when !eol here because there
	**  will be a put_block done below; we do *not* use the value
	**  of start_of_data (as a pointer) in the computation of
	**  length (or anything else) when !eol.  Otherwise, set the
	**  value of length to what we have beyond eol (i.e., beyond
	**  the status line). - FM
	*/
	start_of_data = eol ? eol + 1 : "";
	length = eol ? length - (start_of_data - line_buffer) : 0;

	/*
	**  Trim trailing spaces in line_buffer so that we can use
	**  it in messages which include the status line. - FM
	*/
	while (line_buffer[strlen(line_buffer)-1] == ' ')
	       line_buffer[strlen(line_buffer)-1] = '\0';

	/*
	**  Take appropriate actions based on the status. - FM
	*/
	switch (server_status/100) {
	  case 1:
	    /*
	    **	HTTP/1.1 Informational statuses.
	    **	100 Continue.
	    **	101 Switching Protocols.
	    **	> 101 is unknown.
	    **	We should never get these, and they have only
	    **	the status line and possibly other headers,
	    **	so we'll deal with them by showing the full
	    **	header to the user as text/plain. - FM
	    */
	    HTAlert("Got unexpected Informational Status.");
	    do_head = TRUE;
	    break;

	  case 2:
	    /*
	    **	Good: Got MIME object! (Successful) - FM
	    */
	    if (do_head) {
		/*
		 *  If HEAD was requested, show headers (and possibly
		 *  bogus body) for all 2xx status codes as text/plain - KW
		 */
		HTProgress(line_buffer);
		break;
	    }
	    switch (server_status) {
	      case 204:
		/*
		 *  No Content.
		 */
		HTAlert(line_buffer);
		HTTP_NETCLOSE(s, handle);
		status = HT_NO_DATA;
		goto clean_up;

	      case 205:
		/*
		 *  Reset Content.  The server has fulfilled the
		 *  request but nothing is returned and we should
		 *  reset any form content.  We'll instruct the
		 *  user to do that, and restore the current
		 *  document. - FM
		 */
		HTAlert("Request fulfilled.  Reset Content.");
		HTTP_NETCLOSE(s, handle);
		status = HT_NO_DATA;
		goto clean_up;

	      case 206:
		/*
		 *  Partial Content.  We didn't send a Range
		 *  so something went wrong somewhere.	Show
		 *  the status message and restore the current
		 *  document. - FM
		 */
		HTAlert(line_buffer);
		HTTP_NETCLOSE(s, handle);
		status = HT_NO_DATA;
		goto clean_up;

	      default:
		/*
		 *  200 OK.
		 *  201 Created.
		 *  202 Accepted.
		 *  203 Non-Authoritative Information.
		 *  > 206 is unknown.
		 *  All should return something to display.
		 */
		HTProgress(line_buffer);
	    } /* case 2 switch */
	    break;

	  case 3:
	    /*
	    **	Various forms of Redirection. - FM
	    **	300 Multiple Choices.
	    **	301 Moved Permanently.
	    **	302 Found (temporary; we can, and do, use GET).
	    **	303 See Other (temporary; always use GET).
	    **	304 Not Modified.
	    **	305 Use Proxy.
	    **	306 Set Proxy.
	    **	307 Temporary Redirect with method retained.
	    **	> 308 is unknown.
	    */
	    if (no_url_redirection || do_head || keep_mime_headers) {
		/*
		 *  If any of these flags are set, we do not redirect,
		 *  but instead show what was returned to the user as
		 *  text/plain. - FM
		 */
		HTProgress(line_buffer);
		break;
	    }

	    if (server_status == 300) { /* Multiple Choices */
		/*
		 *  For client driven content negotiation.  The server
		 *  should be sending some way for the user-agent to
		 *  make a selection, so we'll show the user whatever
		 *  the server returns.  There might be a Location:
		 *  header with the server's preference present, but
		 *  the choice should be up to the user, someday based
		 *  on an Alternates: header, and a body always should
		 *  be present with descriptions and links for the
		 *  choices (i.e., we use the latter, for now). - FM
		 */
		HTAlert(line_buffer);
		if (traversal) {
		    HTTP_NETCLOSE(s, handle);
		    status = -1;
		    goto clean_up;
		}
		if (!dump_output_immediately &&
		    format_out == HTAtom_for("www/download")) {
		    /*
		     *	Convert a download request to
		     *	a presentation request for
		     *	interactive users. - FM
		     */
		    format_out = WWW_PRESENT;
		}
		break;
	    }

	    if (server_status == 304) { /* Not Modified */
		/*
		 *  We didn't send an "If-Modified-Since" header,
		 *  so this status is inappropriate.  We'll deal
		 *  with it by showing the full header to the user
		 *  as text/plain. - FM
		 */
		HTAlert("Got unexpected 304 Not Modified status.");
		do_head = TRUE;
		break;
	    }

	    if (server_status == 305 ||
		server_status == 306 ||
		server_status > 307) {
		/*
		 *  Show user the content, if any, for 305, 306,
		 *  or unknown status. - FM
		 */
		HTAlert(line_buffer);
		if (traversal) {
		    HTTP_NETCLOSE(s, handle);
		    status = -1;
		    goto clean_up;
		}
		if (!dump_output_immediately &&
		    format_out == HTAtom_for("www/download")) {
		    /*
		     *	Convert a download request to
		     *	a presentation request for
		     *	interactive users. - FM
		     */
		    format_out = WWW_PRESENT;
		}
		break;
	    }

	    /*
	     *	We do not load the file, but read the headers for
	     *	the "Location:", check out that redirecting_url
	     *	and if it's acceptible (e.g., not a telnet URL
	     *	when we have that disabled), initiate a new fetch.
	     *	If that's another redirecting_url, we'll repeat the
	     *	checks, and fetch initiations if acceptible, until
	     *	we reach the actual URL, or the redirection limit
	     *	set in HTAccess.c is exceeded.	If the status was 301
	     *	indicating that the relocation is permanent, we set
	     *	the permanent_redirection flag to make it permanent
	     *	for the current anchor tree (i.e., will persist until
	     *	the tree is freed or the client exits).  If the
	     *	redirection would include POST content, we seek
	     *	confirmation from an interactive user, with option to
	     *	use 303 for 301 (but not for 307), and otherwise refuse
	     *	the redirection.  We also don't allow permanent
	     *	redirection if we keep POST content.  If we don't find
	     *	the Location header or it's value is zero-length, we
	     *	display whatever the server returned, and the user
	     *	should RELOAD that to try again, or make a selection
	     *	from it if it contains links, or Left-Arrow to the
	     *	previous document. - FM
	     */
	    {
	      char *cp;

	      if ((dump_output_immediately || traversal) &&
		  do_post &&
		  server_status != 303 &&
		  server_status != 302 &&
		  server_status != 301) {
		  /*
		   *  Don't redirect POST content without approval
		   *  from an interactive user. - FM
		   */
		  HTTP_NETCLOSE(s, handle);
		  status = -1;
		  HTAlert(
		       "Redirection of POST content requires user approval.");
		  if (traversal)
		      HTProgress(line_buffer);
		  goto clean_up;
	      }

	      /*
	       *  Get the rest of the headers and data, if
	       *  any, and then close the connection. - FM
	       */
	      while ((status = HTTP_NETREAD(s, line_buffer,
					    (INIT_LINE_SIZE - 1),
					    handle)) > 0) {
		  line_buffer[status] = '\0';
		  StrAllocCat(line_kept_clean, line_buffer);
	      }
	      HTTP_NETCLOSE(s, handle);
	      if (status == HT_INTERRUPTED) {
		  /*
		   *  Impatient user. - FM
		   */
		  CTRACE (tfp, "HTTP: Interrupted followup read.\n");
		  _HTProgress ("Connection interrupted.");
		  status = HT_INTERRUPTED;
		  goto clean_up;
	      }
	      doing_redirect = TRUE;
	      if (server_status == 301) { /* Moved Permanently */
		  HTProgress(line_buffer);
		  if (do_post) {
		      /*
		       *  Don't make the redirection permanent
		       *  if we have POST content. - FM
		       */
		      CTRACE(tfp, "HTTP: Have POST content. Treating 301 (Permanent) as Temporary.\n");
		      HTAlert(
	 "Have POST content. Treating Permanent Redirection as Temporary.\n");
		  } else {
		      permanent_redirection = TRUE;
		  }
	      }

	      /*
	      **  Look for "Set-Cookie:" and "Set-Cookie2:" headers. - FM
	      */
	      if (LYSetCookies == TRUE) {
		  char *value = NULL;
		  char *SetCookie = NULL;
		  char *SetCookie2 = NULL;
		  cp = line_kept_clean;
		  while (*cp) {
		      /*
		      **  Assume a CRLF pair terminates
		      **  the header section. - FM
		      */
		      if (*cp == CR) {
			  if (*(cp+1) == LF &&
			      *(cp+2) == CR && *(cp+3) == LF) {
			      break;
			  }
		      }
		      if (TOUPPER(*cp) != 'S') {
			  cp++;
		      } else if (!strncasecomp(cp, "Set-Cookie:", 11))	{
			  char *cp1 = NULL, *cp2 = NULL;
			  cp += 11;
Cookie_continuation:
			  /*
			   *  Trim leading spaces. - FM
			   */
			  while (isspace((unsigned char)*cp))
			      cp++;
			  /*
			  **  Accept CRLF, LF, or CR as end of line. - FM
			  */
			  if (((cp1 = strchr(cp, LF)) != NULL) ||
			      (cp2 = strchr(cp, CR)) != NULL) {
			      if (*cp1) {
				  *cp1 = '\0';
				  if ((cp2 = strchr(cp, CR)) != NULL)
				      *cp2 = '\0';
			      } else {
				  *cp2 = '\0';
			      }
			  }
			  if (*cp == '\0') {
			      if (cp1)
				  *cp1 = LF;
			      if (cp2)
				  *cp2 = CR;
			      if (value != NULL) {
				  HTMIME_TrimDoubleQuotes(value);
				  if (SetCookie == NULL) {
				      StrAllocCopy(SetCookie, value);
				  } else {
				      StrAllocCat(SetCookie, ", ");
				      StrAllocCat(SetCookie, value);
				  }
				  FREE(value);
			      }
			      break;
			  }
			  StrAllocCat(value, cp);
			  cp += strlen(cp);
			  if (cp1) {
			      *cp1 = LF;
			      cp1 = NULL;
			  }
			  if (cp2) {
			      *cp2 = CR;
			      cp2 = NULL;
			  }
			  cp1 = cp;
			  if (*cp1 == CR)
			     cp1++;
			  if (*cp1 == LF)
			     cp1++;
			  if (*cp1 == ' ' || *cp1 == '\t') {
			      StrAllocCat(value, " ");
			      cp = cp1;
			      cp++;
			      cp1 = NULL;
			      goto Cookie_continuation;
			  }
			  HTMIME_TrimDoubleQuotes(value);
			  if (SetCookie == NULL) {
			      StrAllocCopy(SetCookie, value);
			  } else {
			      StrAllocCat(SetCookie, ", ");
			      StrAllocCat(SetCookie, value);
			  }
			  FREE(value);
		      } else if (!strncasecomp(cp, "Set-Cookie2:", 12))  {
			  char *cp1 = NULL, *cp2 = NULL;
			  cp += 12;
Cookie2_continuation:
			  /*
			   *  Trim leading spaces. - FM
			   */
			  while (isspace((unsigned char)*cp))
			      cp++;
			  /*
			  **  Accept CRLF, LF, or CR as end of line. - FM
			  */
			  if (((cp1 = strchr(cp, LF)) != NULL) ||
			      (cp2 = strchr(cp, CR)) != NULL) {
			      if (*cp1) {
				  *cp1 = '\0';
				  if ((cp2 = strchr(cp, CR)) != NULL)
				      *cp2 = '\0';
			      } else {
				  *cp2 = '\0';
			      }
			  }
			  if (*cp == '\0') {
			      if (cp1)
				  *cp1 = LF;
			      if (cp2)
				  *cp2 = CR;
			      if (value != NULL) {
				  HTMIME_TrimDoubleQuotes(value);
				  if (SetCookie2 == NULL) {
				      StrAllocCopy(SetCookie2, value);
				  } else {
				      StrAllocCat(SetCookie2, ", ");
				      StrAllocCat(SetCookie2, value);
				  }
				  FREE(value);
			      }
			      break;
			  }
			  StrAllocCat(value, cp);
			  cp += strlen(cp);
			  if (cp1) {
			      *cp1 = LF;
			      cp1 = NULL;
			  }
			  if (cp2) {
			      *cp2 = CR;
			      cp2 = NULL;
			  }
			  cp1 = cp;
			  if (*cp1 == CR)
			     cp1++;
			  if (*cp1 == LF)
			     cp1++;
			  if (*cp1 == ' ' || *cp1 == '\t') {
			      StrAllocCat(value, " ");
			      cp = cp1;
			      cp++;
			      cp1 = NULL;
			      goto Cookie2_continuation;
			  }
			  HTMIME_TrimDoubleQuotes(value);
			  if (SetCookie2 == NULL) {
			      StrAllocCopy(SetCookie2, value);
			  } else {
			      StrAllocCat(SetCookie2, ", ");
			      StrAllocCat(SetCookie2, value);
			  }
			  FREE(value);
		      } else {
			  cp++;
		      }
		  }
		  FREE(value);
		  if (SetCookie != NULL || SetCookie2 != NULL) {
		      LYSetCookie(SetCookie, SetCookie2, anAnchor->address);
		      FREE(SetCookie);
		      FREE(SetCookie2);
		  }
	      }

	      /*
	       *  Look for the "Location:" in the headers. - FM
	       */
	      cp = line_kept_clean;
	      while (*cp) {
		if (TOUPPER(*cp) != 'L') {
		    cp++;
		} else if (!strncasecomp(cp, "Location:", 9)) {
		    char *cp1 = NULL, *cp2 = NULL;
		    cp += 9;
		    /*
		     *	Trim leading spaces. - FM
		     */
		    while (isspace((unsigned char)*cp))
			cp++;
		    /*
		     *	Accept CRLF, LF, or CR as end of header. - FM
		     */
		    if (((cp1 = strchr(cp, LF)) != NULL) ||
			(cp2 = strchr(cp, CR)) != NULL) {
			if (*cp1) {
			    *cp1 = '\0';
			    if ((cp2 = strchr(cp, CR)) != NULL)
				*cp2 = '\0';
			} else {
			    *cp2 = '\0';
			}
			/*
			 *  Load the new URL into redirecting_url,
			 *  and make sure it's not zero-length. - FM
			 */
			StrAllocCopy(redirecting_url, cp);
			HTMIME_TrimDoubleQuotes(redirecting_url);
			if (*redirecting_url == '\0') {
			    /*
			     *	The "Location:" value is zero-length, and
			     *	thus is probably something in the body, so
			     *	we'll show the user what was returned. - FM
			     */
			    CTRACE(tfp, "HTTP: 'Location:' is zero-length!\n");
			    if (cp1)
				*cp1 = LF;
			    if (cp2)
				*cp2 = CR;
			    bad_location = TRUE;
			    FREE(redirecting_url);
			    HTAlert(
			       "Got redirection with a bad Location header.");
			    HTProgress(line_buffer);
			    break;
			}

			/*
			 *  Set up for checking redirecting_url in
			 *  LYGetFile.c for restrictions before we
			 *  seek the document at that Location. - FM
			 */
			HTProgress(line_buffer);
			CTRACE(tfp, "HTTP: Picked up location '%s'\n",
				    redirecting_url);
			if (cp1)
			    *cp1 = LF;
			if (cp2)
			    *cp2 = CR;
			if (server_status == 305) { /* Use Proxy */
			    /*
			     *	Make sure the proxy field ends with
			     *	a slash. - FM
			     */
			    if (redirecting_url[strlen(redirecting_url)-1]
				!= '/')
				StrAllocCat(redirecting_url, "/");
			    /*
			     *	Append our URL. - FM
			     */
			    StrAllocCat(redirecting_url, anAnchor->address);
			    CTRACE(tfp, "HTTP: Proxy URL is '%s'\n",
					redirecting_url);
			}
			if (!do_post ||
			    server_status == 303 ||
			    server_status == 302) {
			    /*
			     *	We don't have POST content (nor support PUT
			     *	or DELETE), or the status is "See Other"  or
			     *	"General Redirection" and we can convert to
			     *	GET, so go back and check out the new URL. - FM
			     */
			    status = HT_REDIRECTING;
			    goto clean_up;
			}
			/*
			 *  Make sure the user wants to redirect
			 *  the POST content, or treat as GET - FM & DK
			 */
			switch (HTConfirmPostRedirect(redirecting_url,
						      server_status)) {
			    /*
			     *	User failed to confirm.
			     *	Abort the fetch.
			     */
			    case 0:
				doing_redirect = FALSE;
				FREE(redirecting_url);
				status = HT_NO_DATA;
				goto clean_up;

			    /*
			     *	User wants to treat as GET with no content.
			     *	Go back to check out the URL.
			     */
			    case 303:
				status = HT_REDIRECTING;
				goto clean_up;

			    /*
			     *	Set the flag to retain the POST
			     *	content and go back to check out
			     *	the URL. - FM
			     */
			    default:
				status = HT_REDIRECTING;
				redirect_post_content = TRUE;
				goto clean_up;
			}
		    }
		    break;
		} else {
		    /*
		     *	Keep looking for the Location header. - FM
		     */
		    cp++;
		}
	      }

	      /*
	       *  If we get to here, we didn't find the Location
	       *  header, so we'll show the user what we got, if
	       *  anything. - FM
	       */
	      CTRACE (tfp, "HTTP: Failed to pick up location.\n");
	      doing_redirect = FALSE;
	      permanent_redirection = FALSE;
	      start_of_data = line_kept_clean;
	      length = strlen(start_of_data);
	      if (!bad_location) {
		  HTAlert("Got redirection with no Location header.");
		  HTProgress(line_buffer);
	      }
	      if (traversal) {
		  HTTP_NETCLOSE(s, handle);
		  status = -1;
		  goto clean_up;
	      }
	      if (!dump_output_immediately &&
		  format_out == HTAtom_for("www/download")) {
		  /*
		   *  Convert a download request to
		   *  a presentation request for
		   *  interactive users. - FM
		   */
		  format_out = WWW_PRESENT;
	      }
	      break;
	   }

	  case 4:
	    /*
	    **	"I think I goofed!" (Client Error) - FM
	    */
	    switch (server_status) {
	      case 401:  /* Unauthorized */
		/*
		 *  Authorization for orgin server required.
		 *  If show_401 is set, proceed to showing the
		 *  401 body.  Otherwise, if we can set up
		 *  authorization based on the WWW-Authenticate
		 *  header, and the user provides a username and
		 *  password, try again.  Otherwise, check whether
		 *  to show the 401 body or restore the current
		 *  document. - FM
		 */
		if (show_401)
		    break;
		if (HTAA_shouldRetryWithAuth(start_of_data, length, s, NO)) {

		    HTTP_NETCLOSE(s, handle);
		    if (dump_output_immediately && !authentication_info[0]) {
			fprintf(stderr,
				"HTTP: Access authorization required.\n");
			fprintf(stderr,
				"       Use the -auth=id:pw parameter.\n");
			status = HT_NO_DATA;
			goto clean_up;
		    }

		    CTRACE(tfp, "%s %d %s\n",
				"HTTP: close socket", s,
				"to retry with Access Authorization");

		    _HTProgress (
			"Retrying with access authorization information.");
		    FREE(line_buffer);
		    FREE(line_kept_clean);
		    goto try_again;
		} else if (!(traversal || dump_output_immediately) &&
			   HTConfirm("Show the 401 message body?")) {
		    break;
		} else {
		    if (traversal || dump_output_immediately)
			HTAlert(
	"Can't retry with authorization!  Contact the server's WebMaster.");
		    HTTP_NETCLOSE(s, handle);
		    status = -1;
		    goto clean_up;
		}

	      case 407:
		/*
		 *  Authorization for proxy server required.
		 *  If we are not in fact using a proxy, or
		 *  show_407 is set, proceed to showing the
		 *  407 body.  Otherwise, if we can set up
		 *  authorization based on the Proxy-Authenticate
		 *  header, and the user provides a username and
		 *  password, try again.  Otherwise, check whether
		 *  to show the 401 body or restore the current
		 *  document. - FM & AJL
		 */
		if (!using_proxy || show_407)
		    break;
		if (HTAA_shouldRetryWithAuth(start_of_data, length, s, YES)) {

		    HTTP_NETCLOSE(s, handle);
		    if (dump_output_immediately && !proxyauth_info[0]) {
			fprintf(stderr,
				"HTTP: Proxy authorization required.\n");
			fprintf(stderr,
				"       Use the -pauth=id:pw parameter.\n");
			status = HT_NO_DATA;
			goto clean_up;
		    }

		    CTRACE(tfp, "%s %d %s\n",
				"HTTP: close socket", s,
				"to retry with Proxy Authorization");

		    _HTProgress (
			"Retrying with proxy authorization information.");
		    FREE(line_buffer);
		    FREE(line_kept_clean);
		    goto try_again;
		} else if (!(traversal || dump_output_immediately) &&
			   HTConfirm("Show the 407 message body?")) {
		    if (!dump_output_immediately &&
			format_out == HTAtom_for("www/download")) {
			/*
			 *  Convert a download request to
			 *  a presentation request for
			 *  interactive users. - FM
			 */
			format_out = WWW_PRESENT;
		    }
		    break;
		} else {
		    if (traversal || dump_output_immediately)
			HTAlert(
    "Can't retry with proxy authorization!  Contact the server's WebMaster.");
		    HTTP_NETCLOSE(s, handle);
		    status = -1;
		    goto clean_up;
		}

	      case 408:
		/*
		 *  Request Timeout.  Show the status message
		 *  and restore the current document. - FM
		 */
		HTAlert(line_buffer);
		HTTP_NETCLOSE(s, handle);
		status = HT_NO_DATA;
		goto done;

	      default:
		/*
		 *  400 Bad Request.
		 *  402 Payment Required.
		 *  403 Forbidden.
		 *  404 Not Found.
		 *  405 Method Not Allowed.
		 *  406 Not Acceptable.
		 *  409 Conflict.
		 *  410 Gone.
		 *  411 Length Required.
		 *  412 Precondition Failed.
		 *  413 Request Entity Too Large.
		 *  414 Request-URI Too Long.
		 *  415 Unsupported Media Type.
		 *  416 List Response (for content negotiation).
		 *  > 416 is unknown.
		 *  Show the status message, and display
		 *  the returned text if we are not doing
		 *  a traversal. - FM
		 */
		HTAlert(line_buffer);
		if (traversal) {
		    HTTP_NETCLOSE(s, handle);
		    status = -1;
		    goto clean_up;
		}
		if (!dump_output_immediately &&
		    format_out == HTAtom_for("www/download")) {
		    /*
		     *	Convert a download request to
		     *	a presentation request for
		     *	interactive users. - FM
		     */
		    format_out = WWW_PRESENT;
		}
		break;
	    } /* case 4 switch */
	    break;

	  case 5:
	    /*
	    **	"I think YOU goofed!" (server error)
	    **	500 Internal Server Error
	    **	501 Not Implemented
	    **	502 Bad Gateway
	    **	503 Service Unavailable
	    **	504 Gateway Timeout
	    **	505 HTTP Version Not Supported
	    **	> 505 is unknown.
	    **	Should always include a message, which
	    **	we always should display. - FM
	    */
	    HTAlert(line_buffer);
	    if (traversal) {
		HTTP_NETCLOSE(s, handle);
		status = -1;
		goto clean_up;
	    }
	    if (!dump_output_immediately &&
		format_out == HTAtom_for("www/download")) {
		/*
		 *  Convert a download request to
		 *  a presentation request for
		 *  interactive users. - FM
		 */
		format_out = WWW_PRESENT;
	    }
	    break;

	  default:
	    /*
	    **	Bad or unknown server_status number.
	    **	Take a chance and hope there is
	    **	something to display. - FM
	    */
	    HTAlert("Unknown status reply from server!");
	    HTAlert(line_buffer);
	    if (traversal) {
		HTTP_NETCLOSE(s, handle);
		status = -1;
		goto clean_up;
	    }
	    if (!dump_output_immediately &&
		format_out == HTAtom_for("www/download")) {
		/*
		 *  Convert a download request to
		 *  a presentation request for
		 *  interactive users. - FM
		 */
		format_out = WWW_PRESENT;
	    }
	    break;
	} /* Switch on server_status/100 */

      } /* Full HTTP reply */
  } /* scope of fields */

  /*
  **  Set up the stream stack to handle the body of the message.
  */
  if (do_head || keep_mime_headers) {
      /*
      **  It was a HEAD request, or we want the headers and source.
      */
      start_of_data = line_kept_clean;
      length = strlen(start_of_data);
      format_in = HTAtom_for("text/plain");
  }

  target = HTStreamStack(format_in,
			 format_out,
			 sink, anAnchor);

  if (!target || target == NULL) {
      char buffer[1024];	/* @@@@@@@@ */

      HTTP_NETCLOSE(s, handle);
      sprintf(buffer, "Sorry, no known way of converting %s to %s.",
	      HTAtom_name(format_in), HTAtom_name(format_out));
      _HTProgress (buffer);
      status = -1;
      goto clean_up;
  }

  /*
  **  Recycle the first chunk of data, in all cases.
  */
  (*target->isa->put_block)(target, start_of_data, length);

  /*
  **  Go pull the bulk of the data down.
  */
  rv = HTCopy(anAnchor, s, (void *)handle, target);

  if (rv == -1) {
      /*
      **  Intentional interrupt before data were received, not an error
      */
      /* (*target->isa->_abort)(target, NULL); */ /* already done in HTCopy */
      status = HT_INTERRUPTED;
      HTTP_NETCLOSE(s, handle);
      goto clean_up;
  }

  if (rv == -2) {
      /*
      **  Aw hell, a REAL error, maybe cuz it's a dumb HTTP0 server
      */
      (*target->isa->_abort)(target, NULL);
      HTTP_NETCLOSE(s, handle);
      if (!already_retrying && !do_post) {
	  CTRACE (tfp, "HTTP: Trying again with HTTP0 request.\n");
	  /*
	  **  May as well consider it an interrupt -- right?
	  */
	  FREE(line_buffer);
	  FREE(line_kept_clean);
	  extensions = NO;
	  already_retrying = TRUE;
	  _HTProgress ("Retrying as HTTP0 request.");
	  goto try_again;
      } else {
	  status = HT_NOT_LOADED;
	  goto clean_up;
      }
  }

  /*
  **  Free if complete transmission (socket was closed before return).
  **  Close socket if partial transmission (was freed on abort).
  */
  if (rv != HT_INTERRUPTED) {
      (*target->isa->_free)(target);
  } else {
      HTTP_NETCLOSE(s, handle);
  }

  if (doing_redirect) {
      /*
      **  We already jumped over all this if the "case 3:" code worked
      **  above, but we'll check here as a backup in case it fails. - FM
      */
      /* Lou's old comment:  - FM */
      /* OK, now we've got the redirection URL temporarily stored
	 in external variable redirecting_url, exported from HTMIME.c,
	 since there's no straightforward way to do this in the library
	 currently.  Do the right thing. */
      status = HT_REDIRECTING;
  } else {
      /*
      **  If any data were received, treat as a complete transmission
      */
      status = HT_LOADED;
  }

  /*
  **  Clean up
  */
clean_up:
  FREE(line_buffer);
  FREE(line_kept_clean);

done:
  /*
  **  Clear out on exit, just in case.
  */
  do_head = FALSE;
  do_post = FALSE;
  reloading = FALSE;
  return status;
}

/*	Protocol descriptor
*/
#ifdef GLOBALDEF_IS_MACRO
#define _HTTP_C_GLOBALDEF_1_INIT { "http", HTLoadHTTP, 0}
GLOBALDEF (HTProtocol,HTTP,_HTTP_C_GLOBALDEF_1_INIT);
#define _HTTP_C_GLOBALDEF_2_INIT { "https", HTLoadHTTP, 0}
GLOBALDEF (HTProtocol,HTTPS,_HTTP_C_GLOBALDEF_2_INIT);
#else
GLOBALDEF PUBLIC HTProtocol HTTP = { "http", HTLoadHTTP, 0 };
GLOBALDEF PUBLIC HTProtocol HTTPS = { "https", HTLoadHTTP, 0 };
#endif /* GLOBALDEF_IS_MACRO */
