I'm trying to setup AngularJS to communicate with a cross-origin resource where the asset host which delivers my template files is on a different domain and therefore the XHR request that angular performs must be cross-domain. I've added the appropriate CORS header to my server for the HTTP request to make this work, but it doesn't seem to work. The problem is that when I inspect the HTTP requests in my browser (chrome) the request sent to the asset file is an OPTIONS request (it should be a GET request).
我不确定这是AngularJS中的一个bug，还是我需要配置一些东西。根据我的理解，XHR包装器不能做出一个OPTIONS HTTP请求，所以看起来就像浏览器在执行GET请求之前试图弄清楚是否“允许”首先下载资产。如果是这种情况，那么我是否需要与资产主机一起设置CORS头(Access-Control-Allow-Origin: http://asset.host…)?
以下是我在ASP上修复这个问题的方法。网
First, you should add the nuget package Microsoft.AspNet.WebApi.Cors
Then modify the file App_Start\WebApiConfig.cs
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.EnableCors();
...
}
}
Add this attribute on your controller class
[EnableCors(origins: "*", headers: "*", methods: "*")]
public class MyController : ApiController
{
[AcceptVerbs("POST")]
public IHttpActionResult Post([FromBody]YourDataType data)
{
...
return Ok(result);
}
}
I was able to send json to the action by this way
$http({
method: 'POST',
data: JSON.stringify(data),
url: 'actionurl',
headers: {
'Content-Type': 'application/json; charset=UTF-8'
}
}).then(...)
参考:
在ASP中启用跨源请求。NET Web API 2
来的有点晚了
如果你正在使用Angular 7(或5/6/7)和PHP作为API，并且仍然得到这个错误，尝试在端点(PHP API)中添加以下头选项。
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: PUT, GET, POST, PUT, OPTIONS, DELETE, PATCH");
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept, Authorization");
注意:只需要Access-Control-Allow-Methods。但是，我在这里粘贴了另外两个Access-Control-Allow-Origin和Access-Control-Allow-Headers，只是因为你需要正确地设置所有这些，以便Angular应用能够正确地与你的API对话。
希望这能帮助到一些人。
欢呼。
如果你正在使用Jersey的REST API，你可以这样做
你不需要改变你的webservices实现。
我会解释Jersey 2.x
1)首先添加一个ResponseFilter，如下所示
import java.io.IOException;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
public class CorsResponseFilter implements ContainerResponseFilter {
@Override
public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext)
throws IOException {
responseContext.getHeaders().add("Access-Control-Allow-Origin","*");
responseContext.getHeaders().add("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT");
}
}
2)然后在web.xml中，在jersey servlet声明中添加如下内容
<init-param>
<param-name>jersey.config.server.provider.classnames</param-name>
<param-value>YOUR PACKAGE.CorsResponseFilter</param-value>
</init-param>
