Remove X-Pad work around.

Changes with Apache 2.3.0

[ When backported to 2.2.x, remove entry from this file ]

  *) Remove X-Pad header which was added as a work around to a bug in 

     Netscape 2.x to 4.0b2. [Takashi Sato <takashi lans-tv.com>]

  *) Add DTrace Statically Defined Tracing (SDT) probes.

    [Theo Schlossnagle <jesus omniti.com>, Paul Querna]

    basic_http_header(r, bb, protocol);

}

/* Navigator versions 2.x, 3.x and 4.0 betas up to and including 4.0b2

 * have a header parsing bug.  If the terminating \r\n occur starting

 * at offset 256, 257 or 258 of output then it will not properly parse

 * the headers.  Curiously it doesn't exhibit this problem at 512, 513.

 * We are guessing that this is because their initial read of a new request

 * uses a 256 byte buffer, and subsequent reads use a larger buffer.

 * So the problem might exist at different offsets as well.

 *

 * This should also work on keepalive connections assuming they use the

 * same small buffer for the first read of each new request.

 *

 * At any rate, we check the bytes written so far and, if we are about to

 * tickle the bug, we instead insert a bogus padding header.  Since the bug

 * manifests as a broken image in Navigator, users blame the server.  :(

 * It is more expensive to check the User-Agent than it is to just add the

 * bytes, so we haven't used the BrowserMatch feature here.

 */

static void terminate_header(apr_bucket_brigade *bb)

{

    char tmp[] = "X-Pad: avoid browser bug" CRLF;

    char crlf[] = CRLF;

    apr_off_t len;

    apr_size_t buflen;

    (void) apr_brigade_length(bb, 1, &len);

    if (len >= 255 && len <= 257) {

        buflen = strlen(tmp);

        ap_xlate_proto_to_ascii(tmp, buflen);

        apr_brigade_write(bb, NULL, NULL, tmp, buflen);

    }

    buflen = strlen(crlf);

    ap_xlate_proto_to_ascii(crlf, buflen);

    apr_brigade_write(bb, NULL, NULL, crlf, buflen);