cURL send json file to API with custom header in PHP

Question

So having a small issue sending a file to API using cURL

This is the given example that works

curl -X POST \
  --header "Content-Type:application/json" \
  -d @trace.json \
  "https://api.mapbox.com/matching/v4/mapbox.driving.json"

This return me the accurate data.

What I am trying to achieve is the same but using vanilla PHP

function sendRequest() {
    // initialise the curl request
    $request = curl_init('https://api.mapbox.com/matching/v4/mapbox.driving.json');

    // send a file
    curl_setopt($request, CURLOPT_POST, true);
    curl_setopt(
    $request,
    CURLOPT_POSTFIELDS,
    array(
      'header' => 'Content-Type:application/json',
      'file' => '@' . realpath('trace.json')
    ));

    // output the response
    curl_setopt($request, CURLOPT_RETURNTRANSFER, true);
    echo curl_exec($request);

    // close the session
    curl_close($request);

}
sendRequest();

I have tried this, but this returns me a invalid input error, although the input is copied from the example.

I have a feeling that its either down to the CURLOPT_POSTFIELDS that I am sending or the whole structure is wrong.

Answer 1

Use CURLOPT_HTTPHEADER , and not pass headers to POST data, like this:

curl_setopt($request, CURLOPT_HTTPHEADER, array(
    'Content-Type:application/json'
));

curl_setopt($request, CURLOPT_POSTFIELDS, array(
    'file_contents' => '@' . realpath('trace.json')
));