我会得到以下错误。当我尝试从Angular 5.0发送请求时。
请求标题字段访问访问控制 - 允许在前响应中的访问控制 - 允许头部不允许使用。
(使用Postman,API调用作品(
以下是角代码
let config = {
headers: {
"Content-Type": "application/json,charset=utf-8",
"access-control-allow-origin": "*",
"access-control-allow-methods": "GET, POST, PUT, DELETE, OPTIONS",
"access-control-allow-headers": "Origin, X-Requested-With, Content-Type, Accept, Authorization"
}
}
let obs = this.httpClient.post('http://localhost:56557/api/tw/',bodypara,config);
以下是Web配置更改
<system.webServer>
<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" />-->
<add name="Browser Link for HTML" path="*.html" verb="*"
type="System.Web.StaticFileHandler, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
resourceType="File" preCondition="integratedMode" />
</handlers>
<validation validateIntegratedModeConfiguration="false" />
<modules>
<remove name="ApplicationInsightsWebTracking" />
<add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler" />
</modules>
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Headers" value="Origin, X-Requested-With, Content-Type, Accept, Authorization" />
<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
</customHeaders>
</httpProtocol>
</system.webServer>
您已经告诉您的应用程序,access-control-allow-*
标头不允许不包含在Access-Control-Allow-Headers
选项中:
<add name="Access-Control-Allow-Headers" value="Origin, X-Requested-With, Content-Type, Accept, Authorization" />
这就是为什么您会看到错误。
另外,access-control-allow-*
标头都是响应标头,无论如何,服务器通常都会被服务器忽略。只需从您的请求中删除它们。
只需在服务器上的文件顶部添加以下代码。
header("Access-Control-Allow-Origin: *");
header('Access-Control-Allow-Methods: GET, POST');
header("Access-Control-Allow-Headers: X-Requested-With");
如果您在Angular或请求文件中设置特定标题
您需要如下所示输入它们:
Access-Control-Allow-Origin: [SCHEME]://[HOST]:[PORT_OPTIONAL]
方案 => http/https
主机 => server ip/domain name
port_optional => port //optional