blob_reset(&x);
  }
  if( save_httpauth_prompt() ){
    set_httpauth(zHttpAuth);
  }
  return zHttpAuth;
}

/*
** Send content pSend to the the server identified by g.url using the
** external program given by g.zHttpCmd.  Capture the reply from that
** program and load it into pReply.
**
** This routine implements the --transport-command option for "fossil sync".
*/
static int http_exchange_external(
  Blob *pSend,                /* Message to be sent */
  Blob *pReply,               /* Write the reply here */
  int mHttpFlags,             /* Flags.  See above */
  const char *zAltMimetype    /* Alternative mimetype if not NULL */
){
  char *zUplink;
  char *zDownlink;
  char *zCmd;
  int rc;

  zUplink = fossil_temp_filename();
  zDownlink = fossil_temp_filename();
  zCmd = mprintf("%s %$ %$ %$", g.zHttpCmd, g.url.canonical,zUplink,zDownlink);
  blob_write_to_file(pSend, zUplink);
  if( g.fHttpTrace ){
    fossil_print("RUN: %s\n", zCmd);
  }
  rc = fossil_system(zCmd);
  if( rc ){
    fossil_warning("Transport command failed: %s\n", zCmd);
  }    
  fossil_free(zCmd);
  file_delete(zUplink);
  if( file_size(zDownlink, ExtFILE)<0 ){
    blob_zero(pReply);
  }else{
    blob_read_from_file(pReply, zDownlink, ExtFILE);
    file_delete(zDownlink);
  }
  return rc; 
}

/*
** Sign the content in pSend, compress it, and send it to the server
** via HTTP or HTTPS.  Get a reply, uncompress the reply, and store the reply
** in pRecv.  pRecv is assumed to be uninitialized when
** this routine is called - this routine will initialize it.
**

  int iRecvLen;         /* Received length of the reply payload */
  int rc = 0;           /* Result code */
  int iHttpVersion;     /* Which version of HTTP protocol server uses */
  char *zLine;          /* A single line of the reply header */
  int i;                /* Loop counter */
  int isError = 0;      /* True if the reply is an error message */
  int isCompressed = 1; /* True if the reply is compressed */

  if( g.zHttpCmd!=0 ){
    /* Handle the --transport-command option for "fossil sync" and similar */
    return http_exchange_external(pSend,pReply,mHttpFlags,zAltMimetype);
  }

  if( transport_open(&g.url) ){
    fossil_warning("%s", transport_errmsg(&g.url));
    return 1;
  }

  /* Construct the login card and prepare the complete payload */

    mHttpFlags &= ~HTTP_GENERIC;
  }
  db_find_and_open_repository(OPEN_OK_NOT_FOUND|OPEN_ANY_SCHEMA, 0);
  verify_all_options();
  if( g.argc<3 || g.argc>5 ){
    usage("URL ?PAYLOAD? ?OUTPUT?");
  }
  zInFile = g.argc>=4 ? g.argv[3] : 0;
  if( g.argc==5 ){
    if( zOutFile ){
      fossil_fatal("output file specified twice: \"--out %s\" and \"%s\"",
        zOutFile, g.argv[4]);
    }
    zOutFile = g.argv[4];
  }

  int fAnyTrace;          /* Any kind of tracing */
  char *zHttpAuth;        /* HTTP Authorization user:pass information */
  int fSystemTrace;       /* Trace calls to fossil_system(), --systemtrace */
  int fSshTrace;          /* Trace the SSH setup traffic */
  int fSshClient;         /* HTTP client flags for SSH client */
  int fNoHttpCompress;    /* Do not compress HTTP traffic (for debugging) */
  char *zSshCmd;          /* SSH command string */
  const char *zHttpCmd;   /* External program to do HTTP requests */
  int fNoSync;            /* Do not do an autosync ever.  --nosync */
  int fIPv4;              /* Use only IPv4, not IPv6. --ipv4 */
  char *zPath;            /* Name of webpage being served */
  char *zExtra;           /* Extra path information past the webpage name */
  char *zBaseURL;         /* Full text of the URL being served */
  char *zHttpsURL;        /* zBaseURL translated to https: */
  char *zTop;             /* Parent directory of zPath */

    *pSyncFlags |= SYNC_ALLURL;
  }
  if( ((*pSyncFlags) & SYNC_PULL)!=0
   && find_option("share-links",0,0)!=0
  ){
    *pSyncFlags |= SYNC_SHARE_LINKS;
  }

  /* Undocumented option:  --transport-command COMMAND
  **
  ** Causes COMMAND to be run with three arguments in order to talk
  ** to the server.
  **
  **       COMMAND URL PAYLOAD REPLY
  **
  ** URL is the server name.  PAYLOAD is the name of a temporary file
  ** that will contain the xfer-protocol payload to send to the server.
  ** REPLY is a temporary filename in which COMMAND should write the
  ** content of the reply from the server.
  */
  g.zHttpCmd = find_option("transport-command",0,1);

  url_proxy_options();
  clone_ssh_find_options();
  if( !uvOnly ) db_find_and_open_repository(0, 0);
  db_open_config(0, 1);
  if( g.argc==2 ){
    if( db_get_boolean("auto-shun",0) ) configSync = CONFIGSET_SHUN;
  }else if( g.argc==3 ){