asp.net 设置跨域访问

1. 在web.config中添加(全局)

<system.webServer>
    <httpProtocol>
        <customHeaders>
            <add name="Access-Control-Allow-Methods" value="OPTIONS,POST,GET"/>
            <add name="Access-Control-Allow-Headers" value="x-requested-with"/>
            <add name="Access-Control-Allow-Origin" value="*" />
        </customHeaders>
    </httpProtocol>
</system.webServer>

2. 设置单个一般处理程序可以跨域

context.Response.ClearHeaders();  
context.Response.AppendHeader("Access-Control-Allow-Origin","*");  
string requestHeaders = context.Request.Headers["Access-Control-Request-Headers"];  
context.Response.AppendHeader("Access-Control-Allow-Headers", 
string.IsNullOrEmpty(requestHeaders) ? "*" : requestHeaders);  
context.Response.AppendHeader("Access-Control-Allow-Methods", "POST, OPTIONS")；