PHP Curl Post Returns a 415 - Unsupported Media Type

PHP cURL POST returns a 415 - Unsupported Media Type

Problem solved! Here's the issue:

Sending an associative-array of headers DOES NOT WORK with cURL. There are several forums scattered around that show examples using an associative array for headers. DON'T DO IT!

The correct way (which is also scattered around the internets, but that I'm too dense to have noticed) is to construct your header key/value pairs as strings, and pass a standard array of these strings when setting the CURLOPT_HTTPHEADER option.

So in summary,

WRONG:

$headers = array(    "Accept-Encoding" =>    "gzip",
                     "Content-Type" =>       "application/json",
                     "custom_header_1" =>    "test011",
                     "custom_header_2" =>    "test012",
                     "custom_header_3" =>    "test013");

RIGHT:

$headers = array(    "Accept-Encoding: gzip",
                     "Content-Type: application/json",
                     "custom_header_1: test011",
                     "custom_header_2: test012",
                     "custom_header_3: test013");

I hope this comes in handy to some other noble doofus down the road before they waste as much time debugging as I did.

If I had to guess, I would assume that the same rule applies to the POST body key/value pairs as well, which is why @drew010 's comment about using http_build_query() or json_encode() to stringify your message body is a great idea as well.

Thanks to everyone for your very useful comments, and for you time and consideration. In the end, a side by side comparison of the http traffic (captured via Wireshark) revealed the issue.

Thanks!

Curl : HTTP 415 Unsupported Media Type

Your missing the post data. I'm not sure of your exact query but an example query is in this code:

<?php
function getContentCurl($url)
{
    $ch =  curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:25.0) Gecko/20100101 Firefox/25.0');
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
    curl_setopt($ch, CURLOPT_TIMEOUT, 3);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_ENCODING, "gzip");
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
    curl_setopt($ch, CURLOPT_POSTFIELDS, '{"activeFiltre":true,"motsCles":"","fonctions":[],"lieux":[],"pointGeolocDeReference":{},"secteursActivite":[],"typesContrat":[],"typesConvention":[],"niveauxExperience":[],"sorts":[{"type":"DATE","direction":"DESCENDING"}],"pagination":{"startIndex":0,"range":20},"typeClient":"CADRE"}');                                         

    return $result = curl_exec($ch);

}

$url = "https://cadres.apec.fr/cms/webservices/rechercheOffre/ids";
$content =  getContentCurl($url);

var_dump($content);

Outputs:

 string(4083) "{"totalCount":78073,"offreFilters":[{"offreFiltering":"CONTRACT_TYPE_FILTERING","offreFilterItems":[{"key":101888,"count":69550},{"key":20053,"count":120},{"key":101930,"count":2144},{"key":101887,"count":6259}]},{"offreFiltering":"CONTRACT_DURATION_FILTERING","offreFilterItems":[{"key":143691,"count":4981},{"key":143692,"count":2562},{"key":143693,"count":976}]},{"offreFiltering":"COMPANY_TYPE_FILTERING","offreFilterItems":[{"key":143684,"count":35345},{"key":143685,"count":18112},{"key":143686,"count":13180},{"key":143687,"count":11436}]},{"offreFiltering":"POSITION_STATUS_FILTERING","offreFilterItems":[{"key":143688,"count":65264},{"key":143689,"count":1629},{"key":143690,"count":11180}]},{"offreFiltering":"EXPERIENCE_FILTERING","offreFilterItems":[{"key":101881,"count":36267},{"key":20043,"count":45182},{"key":20044,"count":11797},{"key":20045,"count":11317}]},{"offreFiltering":"GEOLOCALISABLE_FILTERING","offreFilterItems":[{"key":0,"count":6088},{"key":1,"count":71985}]},{"offreFiltering":"JOB_CODE_FILTERING","offreFilterItems":[{"key":101829,"count":1360},{"key":101828,"count":19240},{"key":101831,"count":11451},{"key":101830,"count":1336},{"key":101833,"count":17141},{"key":101832,"count":10470},{"key":101835,"count":4190},{"key":101834,"count":7131},{"key":101837,"count":11231},{"key":101836,"count":1463}]},{"offreFiltering":"LOCATION_FILTERING","offreFilterItems":[{"key":102099,"count":731},{"key":99700,"count":411},{"key":799,"count":77342}]},{"offreFiltering":"NAF_CODE_FILTERING","offreFilterItems":[{"key":101761,"count":1083},{"key":101760,"count":3773},{"key":101763,"count":3607},{"key":101762,"count":11726},{"key":101765,"count":385},{"key":101764,"count":2123},{"key":101767,"count":1134},{"key":101766,"count":1757},{"key":101769,"count":621},{"key":101768,"count":169},{"key":101771,"count":332},{"key":101770,"count":1241},{"key":101773,"count":9665},{"key":101772,"count":9572},{"key":101775,"count":695},{"key":101774,"count":2410},{"key":101777,"count":1597},{"key":101776,"count":1292},{"key":101779,"count":1308},{"key":101778,"count":336},{"key":101780,"count":158},{"key":101753,"count":11418},{"key":101752,"count":1529},{"key":101755,"count":1026},{"key":101754,"count":2418},{"key":101757,"count":4055},{"key":101756,"count":1413},{"key":101759,"count":959},{"key":101758,"count":271}]},{"offreFiltering":"NIVEAU_ETUDE"},{"offreFiltering":"DUREE_STAGE","offreFilterItems":[{"key":599765,"count":381},{"key":599766,"count":233},{"key":599767,"count":710},{"key":599768,"count":441},{"key":599769,"count":280},{"key":599770,"count":2936},{"key":599771,"count":3538}]},{"offreFiltering":"DATE_PRISE_POSTE","offreFilterItems":[{"key":599777,"count":75435},{"key":599778,"count":2209},{"key":599779,"count":429}]},{"offreFiltering":"PERIOD_FILTERING","offreFilterItems":[{"key":101850,"count":11054},{"key":101851,"count":32259},{"key":101852,"count":78073},{"key":101853,"count":78073}]},{"offreFiltering":"WAGE_FILTERING","offreFilterItems":[{"key":597179,"count":7147},{"key":599738,"count":38996},{"key":101840,"count":56141},{"key":101841,"count":25697},{"key":101842,"count":6213},{"key":101843,"count":1408}]}],"resultats":[{"@uriOffre":"offre?numeroOffre=163035045W"},{"@uriOffre":"offre?numeroOffre=163035043W"},{"@uriOffre":"offre?numeroOffre=163035044W"},{"@uriOffre":"offre?numeroOffre=162918884W"},{"@uriOffre":"offre?numeroOffre=162913997W"},{"@uriOffre":"offre?numeroOffre=163035042W"},{"@uriOffre":"offre?numeroOffre=162930465W"},{"@uriOffre":"offre?numeroOffre=162926697W"},{"@uriOffre":"offre?numeroOffre=163035041W"},{"@uriOffre":"offre?numeroOffre=163035040W"},{"@uriOffre":"offre?numeroOffre=163035039W"},{"@uriOffre":"offre?numeroOffre=163035036W"},{"@uriOffre":"offre?numeroOffre=163035032W"},{"@uriOffre":"offre?numeroOffre=163035031W"},{"@uriOffre":"offre?numeroOffre=163035030W"},{"@uriOffre":"offre?numeroOffre=163035029W"},{"@uriOffre":"offre?numeroOffre=163035027W"},{"@uriOffre":"offre?numeroOffre=163035026W"},{"@uriOffre":"offre?numeroOffre=163035022W"},{"@uriOffre":"offre?numeroOffre=163035020W"}]}"

Got 415 error Unsupported Media Type when use wp_remote_post

Excerpt from KeyCDN:

A 415 Unsupported Media Type error occurs when the origin server
refuses a particular request since the resource is in a format that is not supported by the server for the HTTP
method
used. This unsupported format type issue can be caused by what is
defined in the resource's Content-Type or Content-Encoding
headers.

And in your case, the error happened most likely because your remote request sent the wrong Content-Type header — which defaults to application/x-www-form-urlencoded when the HTTP method is POST.

And yes, you did include the right Content-Type value in your $headers array. But unfortunately in your $arg array which you passed to wp_remote_post(), you used the wrong array key — header, which should actually be headers (note the "s").

So use headers and not header, just as you can see below:

$api_url = 'your API URL';

$body = array(
    'tags' => array(
        array(
            'email' => 'xxx@gmail.com',
            'tag'   => 'Customer5',
        ),
    ),
);

$headers = array(
    'Content-Type'  => 'application/json',
    'User-Agent'    => 'Your App Name (www.yourapp.com)',
    'Authorization' => 'Basic xxxxxx',
);

$arg = array(
    'headers'   => $headers, // good
//  'header'    => $headers, // bad; i.e. wrong array key ('header')
    'body'      => json_encode( $body ),
    // 'method' can be omitted since you're using wp_remote_post()
    'method'    => 'POST',
    'sslverify' => false,
);

$request = wp_remote_post( $api_url, $arg );
// ..if the response still isn't good, what's the output of this:
var_dump( $request );

415 Unsupported Media Type in PostMan but not in curl

I can see two main problems:

1. In body request you are sending an invalid Json, because you add -d before and simple quote at the end (eliminate both).
2. You don't set header/content type right. To achieve it click in Text (on the right binary button) and set in JSON (aplication/json), with that postman add header for request.

Example:

PD: I tried make your request, but I never receive an 200 status code, most requests were timeout (I don't know if you run that server locally or have a special proxy configuration).

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