-* Fixed HttpResponse::setHeader("name", {omitted|NULL|""}) not unsetting header
-* Fixed array parameters to allow NULL in HttpRequest::__construct(),
- HttpRequest::getResposeCookie(), HttpMessage::setHeaders(),
- http_parse_cookie(), http_post_fields().
-* Fixed possible leak in http_send_data() and HttpResponse::setData()
-* Fixed build --without-http-curl-requests (bug #8872)
-* Fixed build with PHP < 4.3.10 (bug #9067)
+* Fixed bug #10151 (build fails dynamic linking on Mac OS X)
+* Allow setting the "proxyhost" request option to an empty string,
+ which lets curl ignore any environment settings
+* Allow unsetting request options by passing NULL:
+ $request->setOptions(array("option" => NULL));