webapi发布常见错误及解决方案

webapi发布常见错误及解决方案

错误一：

错误：404 (Not Found)

解决方案：

在  <system.webServer>节点中添加如下模块：

<modules runAllManagedModulesForAllRequests="true" />

错误二：

错误：405 (Method Not Allowed)或者Response for preflight has invalid HTTP status code 405.

解决方案：（两个条件同时满足才可以）

webapi配置文件：

<modules runAllManagedModulesForAllRequests="true" />  这个是核心，其他的都可以没有这个是必须的（但是安全方面考虑肯定是不可以的，然后通过如下方案方式解决）

2.后端处理：

第一种方案：在控制器中对应的方法都增加一个支持OPTIONS请求的方法，返回202即可；accepted就是202

[HttpOptions]
        public HttpResponseMessage Login()
        {
            return new HttpResponseMessage(HttpStatusCode.Accepted);
        }
        /// <summary>
        /// 用户登陆
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        [HttpPost]
        public HttpResponseMessage Login([FromBody] LoginModel model)
        {
            var cache = HttpRuntime.Cache;
            var user = cache.Get(model.Account) as UserModel;
            if (user == null)
            {
                return Error(1, "用户未注册！");
            }
            if (user.Password != model.Password)
            {
                return Error(1, "用户名或密码错误！");
            }
            return Success(0, "登陆成功！", user);
        }

第二种方案：在Global文件中增加如下这个方法：（推荐使用）

 protected void Application_BeginRequest(object sender, EventArgs e)
        {
            var res = HttpContext.Current.Response;
            var req = HttpContext.Current.Request;

            //自定义header时进行处理
            if (req.HttpMethod == "OPTIONS")
            {
                //res.AppendHeader("Access-Control-Allow-Headers", "Content-Type, X-CSRF-Token, X-Requested-With, Accept, Accept-Version, Content-Length, Content-MD5, Date, X-Api-Version, X-File-Name,Token,Cookie,Authorization");
                //res.AppendHeader("Access-Control-Allow-Methods", "POST,GET,PUT,PATCH,DELETE,OPTIONS");
                res.StatusCode = 202;
                res.End();
            }
        }

 如上如果不可以，可以尝试如下方案：

在  <system.webServer>节点中添加如下模块：

<modules runAllManagedModulesForAllRequests="true" />

-<handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>

或

<modules runAllManagedModulesForAllRequests="true" />

<handlers>
             <remove name="WebDAV" />
             <remove name="WebAPI_64bit" />
             <remove name="WebAPI_32bit" />
             <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />
             <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />
             <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
             <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="*" resourceType="Unspecified" requireAccess="Script" modules="IsapiModule" scriptProcessor="%windir%Microsoft.NETFrameworkv4.0.30319aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />
             <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="*" resourceType="Unspecified" requireAccess="Script" modules="IsapiModule" scriptProcessor="%windir%Microsoft.NETFramework64v4.0.30319aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />
             <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" resourceType="Unspecified" requireAccess="Script" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
             <add name="WebAPI_64bit" path="*" verb="*" modules="IsapiModule" scriptProcessor="%windir%Microsoft.NETFramework64v4.0.30319aspnet_isapi.dll" resourceType="Unspecified" requireAccess="None" preCondition="classicMode,runtimeVersionv4.0,bitness64" />
             <add name="WebAPI_32bit" path="*" verb="*" modules="IsapiModule" scriptProcessor="%windir%Microsoft.NETFrameworkv4.0.30319aspnet_isapi.dll" resourceType="Unspecified" requireAccess="None" preCondition="classicMode,runtimeVersionv4.0,bitness32" />
         </handlers>