I stumbled over a weird behavior when I try to send a post HTTP/2.0 request to apples push service:
$http2ch = curl_init(); curl_setopt($http2ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0); curl_setopt($http2ch, CURLOPT_URL, 'https://api.push.apple.com/3/device/megauniquedevicetokendummy'); curl_setopt($http2ch, CURLOPT_PORT, 443); curl_setopt($http2ch, CURLOPT_HTTPHEADER, $httpHeader); curl_setopt($http2ch, CURLOPT_POST, true); curl_setopt($http2ch, CURLOPT_POSTFIELDS, $body); curl_setopt($http2ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($http2ch, CURLOPT_TIMEOUT, 30); curl_setopt($http2ch, CURLOPT_HEADER, 1); $result = curl_exec($http2ch); if ($result === false) { throw new Exception("Curl failed: " . curl_error($http2ch) . " | " . curl_getinfo($http2ch, CURLINFO_HTTP_CODE)); }
The exception is thrown with the Message: Curl failed: Received HTTP/0.9 when not allowed | 0
I explicitly told curl to use HTTP/2.0 on the second line of the code snipped above. Does anyone have any idea what that error message means and why curl uses such an old HTTP version?
I am on PHP 7.2 and curl version 7.66.0.
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Answer
I figured it out. Make sure that curl is compiled with nghttp2.
If you are unsure, you can check it on your terminal using curl --version
If you dont find nghttp2/{version} you need to compile curl again with nghttp2.
curl --version
example where nghttp2 is missing:
curl 7.66.0 (amd64-portbld-freebsd12.0) libcurl/7.66.0 OpenSSL/1.1.1d zlib/1.2.11
curl --version
example where nghttp2 is available:
curl 7.64.1 (x86_64-apple-darwin19.0) libcurl/7.64.1 (SecureTransport) LibreSSL/2.8.3 zlib/1.2.11 nghttp2/1.39.2