Modify parseContentType function (#518)

README.md

@@ -70,7 +70,7 @@ int main()
 Drogon provides some interfaces for adding controller logic directly in the main() function, for example, user can register a handler like this in Drogon:
 
 ```c++
-app.registerHandler("/test?username={name}",
+app().registerHandler("/test?username={name}",
                     [](const HttpRequestPtr& req,
                        std::function<void (const HttpResponsePtr &)> &&callback,
                        const std::string &name)

README.zh-CN.md

@@ -70,7 +70,7 @@ int main()
 当然，Drogon也提供了一些接口，使用户可以在main()函数中直接添加控制器逻辑，比如，用户可以注册一个lambda处理器到drogon框架中，如下所示：
 
 ```c++
-app.registerHandler("/test?username={name}",
+app().registerHandler("/test?username={name}",
                     [](const HttpRequestPtr& req,
                        std::function<void (const HttpResponsePtr &)> &&callback,
                        const std::string &name)

lib/src/HttpUtils.cc

@@ -1,6 +1,6 @@
 /**
  *
- *  HttpUtils.h
+ *  @file HttpUtils.h
  *  An Tao
  *
  *  Copyright 2018, An Tao.  All rights reserved.
@@ -567,7 +567,8 @@ ContentType parseContentType(const string_view &contentType)
         {"image/bmp", CT_IMAGE_BMP},
         {"image/icns", CT_IMAGE_ICNS},
         {"application/wasm", CT_APPLICATION_WASM},
-        {"text/plain", CT_TEXT_PLAIN}};
+        {"text/plain", CT_TEXT_PLAIN},
+        {"multipart/form-data", CT_MULTIPART_FORM_DATA}};
     auto iter = map_.find(contentType);
     if (iter == map_.end())
         return CT_NONE;