extract host name from custom Host: headers to use for cookies

  char *ppath = conn->ppath; /* three previous function arguments */

  char *host = conn->name;

  const char *te = ""; /* tranfer-encoding */

  char *ptr;

  if(!conn->proto.http) {

    /* Only allocate this struct if we don't already have it! */

     }

  }

  if(!checkheaders(data, "Host:")) {

  ptr = checkheaders(data, "Host:");

  if(ptr) {

    /* If we have a given custom Host: header, we extract the host name

       in order to possibly use it for cookie reasons later on. */

    char *start = ptr+strlen("Host:");

    char *ptr;

    while(*start && isspace((int)*start ))

      start++;

    ptr = start; /* start host-scanning here */

    /* scan through the string to find the end */

    while(*ptr && !isspace((int)*ptr))

      ptr++;

    if(ptr != start) {

      int len=ptr-start;

      conn->allocptr.cookiehost = malloc(len+1);

      if(!conn->allocptr.cookiehost)

        return CURLE_OUT_OF_MEMORY;

      memcpy(conn->allocptr.cookiehost, start, len);

      conn->allocptr.cookiehost[len]=0;

    }

  }    

  else {

    /* if ptr_host is already set, it is almost OK since we only re-use

       connections to the very same host and port, but when we use a HTTP

       proxy we have a persistant connect and yet we must change the Host: