webapi权限常见错误

错误一：

Response for preflight has invalid HTTP status code 405.

解决方案：

屏蔽配置文件中的如下代码

<!--<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>-->

错误二：

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:2062' is therefore not allowed access. The response had HTTP status code 500.
　<!--<add name="access-control-allow-headers" value="accept,origin,token,content-type,Authorization" />-->

解决方案：
跨域造成的，解决跨域即可：

<httpProtocol>
      <customHeaders>
        <!-- Enable Cross Domain AJAX calls -->
        <add name="Access-Control-Allow-Origin" value="http://localhost:2062" />
        <add name="Access-Control-Allow-Methods" value="GET,POST,PUT,DELETE,OPTIONS"/>
        <add name="Access-Control-Allow-Headers" value="Content-Type,Authorization"/>
      </customHeaders>
    </httpProtocol>

错误三：

The 'Access-Control-Allow-Origin' header has a value 'http://localhost:2062/' that is not equal to the supplied origin. Origin 'http://localhost:2062' is therefore not allowed access.

解决方案：

由于手误造成的，域名后面不能有任何字符或符合

正确：'http://localhost:2062

错误：'http://localhost:2062/

错误四：

404 Not Found

解决方案：

增加两个modules任意一个都可以解决404，但如果验证权限会出现405错误；

<modules>
      <remove name="UrlRoutingModule-4.0"/>
      <add name="UrlRoutingModule-4.0" type="System.Web.Routing.UrlRoutingModule" preCondition=""/>
    </modules>

    <modules runAllManagedModulesForAllRequests="true">
      <remove name="WebDAVModule" />
    </modules>

错误五：

Failed to load http://192.168.31.110:8014/api/Login/CheckLogin: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://192.168.31.110:8013' is therefore not allowed access.

解决方案：

 <httpProtocol>

      <customHeaders>

        <add name="Access-Control-Allow-Origin" value="*" />

        <add name="Access-Control-Allow-Headers" value="Content-Type,x-xsrf-token,X-Requested-With" />

        <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />

      </customHeaders>

    </httpProtocol>
错误六：
The requested resource does not support http method 'OPTIONS
解决方案：

错误七：

<!--IIS7/7.5上必须加这个配置,否则访问报错-->

23         <modules runAllManagedModulesForAllRequests="true">

24             <remove name="WebDAVModule" />

25         </modules>

26         <validation validateIntegratedModeConfiguration="false" />

27         <handlers>

28             <remove name="WebDAV" />

29             <remove name="WebAPI_64bit" />

30             <remove name="WebAPI_32bit" />

31             <remove name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" />

32             <remove name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" />

33             <remove name="ExtensionlessUrlHandler-Integrated-4.0" />

34             <add name="ExtensionlessUrlHandler-ISAPI-4.0_32bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" resourceType="Unspecified" requireAccess="Script" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness32" responseBufferLimit="0" />

35             <add name="ExtensionlessUrlHandler-ISAPI-4.0_64bit" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" resourceType="Unspecified" requireAccess="Script" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" preCondition="classicMode,runtimeVersionv4.0,bitness64" responseBufferLimit="0" />

36             <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT,DELETE,PATCH,OPTIONS" resourceType="Unspecified" requireAccess="Script" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />

37             <add name="WebAPI_64bit" path="*" verb="*" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="None" preCondition="classicMode,runtimeVersionv4.0,bitness64" />

38             <add name="WebAPI_32bit" path="*" verb="*" modules="IsapiModule" scriptProcessor="%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" resourceType="Unspecified" requireAccess="None" preCondition="classicMode,runtimeVersionv4.0,bitness32" />

39         </handlers>

-----
错误八：
      <remove name="OPTIONSVerbHandler" />
这个是罪魁祸首，移除即可

HTTP Error 403.14 - Forbidden

Web 服务器被配置为不列出此目录的内容。

解决方案：

jQuery.support.cors = true;//设定支持跨域