耗时POST请求导致500错误，即使该方法的Curl起作用

Question

I have the below chunk of PHP code for hitting a POST API

$client = new \GuzzleHttp\Client(['debug'=>true]);
$response = $client->request(
    $request_method,
    $request_url,
    [
        'json' => $request_data,
        'http_errors' => false
    ]
);

$http_code = $response->getStatusCode();

This results in a 500 response from the server, despite all Headers being properly listed in the debug logs as below:

* Hostname was NOT found in DNS cache
*   Trying 52.xxx.xx.xx...
* Connected to <<hostname>> (52.xxx.xx.xx) port 80 (#0)
> POST /api/rest/auth_key HTTP/1.1
User-Agent: GuzzleHttp/6.2.1 curl/7.38.0 PHP/7.0.9-1~dotdeb+8.1
Content-Type: application/json
Host: <<hostname>>
Content-Length: 42

* upload completely sent off: 42 out of 42 bytes

$request_url above is the complete url for the POST request.
$request_data is JSON content (PHP associative array) to be sent.
$request_method is 'POST' .

Even if I remove the json data from the request, expecting to get a 400 response from the API, I still get the same 500 error. The same request when triggered via Curl works fine with the following code:

$curl = curl_init();
curl_setopt_array($curl, array(
  CURLOPT_URL => $request_url,
  CURLOPT_CUSTOMREQUEST => $request_method,
  CURLOPT_POSTFIELDS => json_encode($request_data),
  CURLOPT_HTTPHEADER => [
    "content-type: application/json"
  ],
));
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

Have been trying to debug this for quite some time & even looked for similar references in SO but to no avail. Any helps in this regard would be great.

Answer 1

I'm not able to comment, since I don't have enough reputation, so if this does not answer your question or resolve the issue, sorry in advance.

I had been experiencing a similar issue, where cURL was working no problem, but I was getting either a 500 response or a 400 Bad Request (Request Too Long). It turns out that when you include json data in the third parameter for a POST request, it is being included in the request's header.

The documentation has some examples where the fourth parameter of the GuzzleHttp\\Psr7\\Request class is used as the body of the request (see http://docs.guzzlephp.org/en/stable/psr7.html ). Once I used this and set the content type explicitly in the header, my issues were resolved.

That means that your request would look like this:

$response = $client->request(
    $request_method,
    $request_url,
    ['Content-Type'=>'application/json'],
    json_encode($request_data)
);

Hopefully this will help you out too!