Libcurl HTTP POST request

Question

I'm currently trying to code an HTTP post request to be able to register on a website from my program. When I run it I get no errors and even the CURLOPT_VERBOSE says that everything went successful.

I hope you guys can give me an advise or help, thanks in advance!

Verbose output:

 * Trying 151.139.128.8:443... * Connected to fontawesome.com (151.139.128.8) port 443 (#0) > POST /api/account HTTP/1.1 Host: fontawesome.com User-Agent: M1000/1.0 Accept: */* Content-Type: application/vnd.api+json; charset=UTF-8 Content-Length: 103 * upload completely sent off: 103 out of 103 bytes * Mark bundle as not supporting multiuse < HTTP/1.1 415 Unsupported Media Type < Date: Fri, 07 Aug 2020 12:45:12 GMT < Cache-Control: max-age=0, private, must-revalidate < cross-origin-window-policy: deny < Server: Cowboy < Strict-Transport-Security: max-age=31536000; preload; includeSubDomains < X-Content-Type-Options: nosniff < x-download-options: noopen < X-Frame-Options: SAMEORIGIN < x-permitted-cross-domain-policies: none < x-request-id: Fij9D99y9W_KuwABOosh < X-XSS-Protection: 1; mode=block < X-HW: 1596804312.cds067.am5.hn,1596804312.cds153.am5.sc,1596804312.cds153.am5.p < Connection: keep-alive < Content-Length: 0 < * Connection #0 to host fontawesome.com left intact OK!

My code :

curl_global_init(CURL_GLOBAL_ALL); CURL* curl = curl_easy_init(); CURLcode res; if (curl) { const char* c = "https://fontawesome.com/api/account"; curl_easy_setopt(curl, CURLOPT_URL, c); curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); curl_easy_setopt(curl, CURLOPT_POST, 1L); curl_easy_setopt(curl, CURLOPT_USERAGENT, "M1000/1.0"); const char *data = "{\"meta\":{},\"data\":{\"type\":\"account\",\"attributes\":{\"email\":\"[email protected]\",\"is - free\":true}}}"; curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(data)); curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data); res = curl_easy_perform(curl); if (res != 0) { curl_easy_cleanup(curl); curl_global_cleanup(); F.SetError__(res); return; } else { F.Print("OK!"); } } curl_easy_cleanup(curl); curl_global_cleanup();

KiNgMaR · Accepted Answer · 2020-08-07 13:14:29Z

Please notice this line in the response:

< HTTP/1.1 415 Unsupported Media Type

You probably want to use curl_easy_getinfo with CURLINFO_RESPONSE_CODE to retrieve and check the HTTP status code from the response.

Depending on the API, response 415 could have a different meaning. In this case it's likely that the server expects a Content-Type: application/json header in the request.

StephenHawking · Accepted Answer · 2020-08-08 10:58:23Z

Thanks to KiNgMaR I fixed it. I started to learn a bit more about headers and HTTP requests and finally found the problem. I was sending the whole time an unsupported media type for the server. After some research I found out wich Content-Type the server accepts, it was "Content-Type: application/vnd.api+json".

What I added to my code :

list = curl_slist_append(list, "Content-Type: application/vnd.api+json"); list = curl_slist_append(list, "Accept: application/vnd.api+json"); curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);

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