使用libmicrohttpd處理POST請求

Question

我必須使用libmicrohttpd來設置REST服務器。 GET請求沒有問題，但我不明白我在做什麼錯誤來處理POST（實際上是PUT）請求（JSON格式）。下面是代碼：

int MHD_answer_to_connection (void* cls, struct MHD_Connection* connection, 
       const char* url, 
       const char* method, const char* version, 
       const char* upload_data, 
       size_t* upload_data_size, void** con_cls) { 


    // Initializes parser/camera/settings... 
    static Parser parser; 

    // The first time only the headers are valid, do not respond in the first round 
    static int dummy; 
    if (*con_cls != &dummy) { 
    *con_cls = &dummy; 
    return MHD_YES; 
    } 

    // Parse URL to get the resource 
    int resource = parser.getRequestedResource(url); 

    // Check wether if it's a GET or a POST method 
    if(strcmp(method, MHD_HTTP_METHOD_GET) == 0) { 
    parser.processGetRequest(resource); 
    } 
    else { 
    parser.processPutRequest(upload_data, *upload_data_size); 
    } 

    // Building HTTP response (headers+data) 
    MHD_Response* httpResponse = parser.getResponse(); 

    int ret = MHD_queue_response (connection, MHD_HTTP_OK, httpResponse); 

    if (ret != MHD_YES) { 
    Logger::get().error("Error queuing message"); 
    } 

    MHD_destroy_response (httpResponse); 
    // Clear context pointer 
    *con_cls = NULL; 

    return ret; 
} 

每次我試圖發送一個PUT請求一些數據，我得到的「內部應用程序錯誤，關閉連接」。這個問題可能來自這些事情之一：在溫控功能的第一個電話

修改與否* upload_data_size

• 發佈/不發佈響應（以指示處理完成）

• *con_cls = NULL指令

感謝的好位置！

Answer 1

我使用的是GNU libmicrohttpd，我在其repository上找到了一個簡單的POST演示。

演示有點簡單：它有詢問你的名字的形式，所以當你輸入你的名字，然後點擊「發送」按鈕，發佈數據在answer_to_connection()函數處理：

static int answer_to_connection (void *cls, struct MHD_Connection *connection, 
         const char *url, const char *method, 
         const char *version, const char *upload_data, 
         size_t *upload_data_size, void **con_cls) 
{ 


... 

    if (0 == strcmp (method, "POST")) 
    { 
     struct connection_info_struct *con_info = *con_cls; 

     if (*upload_data_size != 0) 
     { 
      MHD_post_process (con_info->postprocessor, upload_data, 
          *upload_data_size); 
      *upload_data_size = 0; 

      return MHD_YES; 
     } 
     else if (NULL != con_info->answerstring) 
     return send_page (connection, con_info->answerstring); 
    } 
...