Function AuthWriteHeadRequest

plugins/authproxy/authproxy.cc:284–314

Transform the client request into a HEAD request and write it out.

// Transform the client request into a HEAD request and write it out.
static bool
AuthWriteHeadRequest(AuthRequestContext *auth)
{
  HttpHeader rq;
  TSMBuffer  mbuf;
  TSMLoc     mhdr;

  TSReleaseAssert(TSHttpTxnClientReqGet(auth->txn, &mbuf, &mhdr) == TS_SUCCESS);

  // First, copy the whole client request to our new auth proxy request.
  TSReleaseAssert(TSHttpHdrCopy(rq.buffer, rq.header, mbuf, mhdr) == TS_SUCCESS);

  // Next, we need to rewrite the client request URL to be a HEAD request.
  TSReleaseAssert(TSHttpHdrMethodSet(rq.buffer, rq.header, TS_HTTP_METHOD_HEAD, -1) == TS_SUCCESS);

  HttpSetMimeHeader(rq.buffer, rq.header, TS_MIME_FIELD_CONTENT_LENGTH, 0u);
  HttpSetMimeHeader(rq.buffer, rq.header, TS_MIME_FIELD_CACHE_CONTROL, "no-cache");

  HttpDebugHeader(rq.buffer, rq.header);

  // Serialize the HTTP request to the write IO buffer.
  TSHttpHdrPrint(rq.buffer, rq.header, auth->iobuf.buffer);

  // We have to tell the auth context not to try to ready the response
  // body (since HEAD can have a content-length but must not have any
  // content).
  auth->read_body = false;

  TSHandleMLocRelease(mbuf, TS_NULL_MLOC, mhdr);
  return true;
}

// Transform the client request into a GET Range: bytes=0-0 request. This is useful
// for example of the authentication service is a caching proxy which might not