Libcurl HTTP POST 请求

Question

我目前正在尝试编写一个 HTTP post 请求，以便能够通过我的程序在网站上注册。当我运行它没有错误，甚至 CURLOPT_VERBOSE 说一切都成功了。

希望大家多多指教或帮助，在此先谢过了！

详细输出：

    *   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!

我的代码：

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@domain.com\",\"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();

Answer 1

请注意回复中的这一行：

< HTTP/1.1 415 Unsupported Media Type

您可能希望将 curl_easy_getinfo 与 CURLINFO_RESPONSE_CODE 结合使用来检索和检查响应中的 HTTP status code。

根据 API，响应 415 可能具有不同的含义。在这种情况下，服务器可能希望请求中有 Content-Type: application/json header。

Answer 2

感谢 KiNgMaR 我修复了它。我开始更多地了解 headers 和 HTTP 请求，终于找到了问题所在。我一直在为服务器发送不支持的媒体类型。经过一番研究，我发现服务器接受的 Content-Type 是 "Content-Type: application/vnd.api+json"。

我添加到代码中的内容：

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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