答案似乎是多次使用头文件。也就是说，而不是发送

Access-Control-Allow-Origin: http://domain1.example, http://domain2.example, http://domain3.example

send

Access-Control-Allow-Origin: http://domain1.example
Access-Control-Allow-Origin: http://domain2.example
Access-Control-Allow-Origin: http://domain3.example

在Apache上，你可以在httpd.conf <VirtualHost> section或.htaccess文件中使用mod_headers和以下语法来实现:

Header add Access-Control-Allow-Origin "http://domain1.example"
Header add Access-Control-Allow-Origin "http://domain2.example"
Header add Access-Control-Allow-Origin "http://domain3.example"

诀窍是使用add而不是append作为第一个参数。

如果您像我一样尝试了这么多代码示例以使它使用CORS工作，值得一提的是，您必须首先清除缓存，以尝试它是否实际工作，类似于旧图像仍然存在的问题，即使它在服务器上被删除了(因为它仍然保存在缓存中)。

例如，CTRL + SHIFT + DEL在谷歌Chrome删除你的缓存。

这帮助我在尝试了许多纯。htaccess解决方案后使用这段代码，这似乎是唯一一个工作(至少对我来说):

    Header add Access-Control-Allow-Origin "http://google.com"
    Header add Access-Control-Allow-Headers "authorization, origin, user-token, x-requested-with, content-type"
    Header add Access-Control-Allow-Methods "PUT, GET, POST, DELETE, OPTIONS"

    <FilesMatch "\.(ttf|otf|eot|woff)$">
        <IfModule mod_headers.c>
            SetEnvIf Origin "http(s)?://(www\.)?(google.com|staging.google.com|development.google.com|otherdomain.com|dev02.otherdomain.net)$" AccessControlAllowOrigin=$0
            Header add Access-Control-Allow-Origin %{AccessControlAllowOrigin}e env=AccessControlAllowOrigin
        </IfModule>
    </FilesMatch>

还要注意，很多解决方案都说你必须输入Header set…但它是头添加....希望这能帮助到像我这样有同样问题的人。

对于ExpressJS应用程序，您可以使用:

app.use((req, res, next) => {
    const corsWhitelist = [
        'https://domain1.example',
        'https://domain2.example',
        'https://domain3.example'
    ];
    if (corsWhitelist.indexOf(req.headers.origin) !== -1) {
        res.header('Access-Control-Allow-Origin', req.headers.origin);
        res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');
    }

    next();
});

下面是一个Java web应用的解决方案，基于yesthatguy的回答。

我使用的是Jersey REST 1.x

配置web.xml以识别Jersey REST和CORSResponseFilter

<!-- Jersey REST config -->
<servlet>
  <servlet-name>JAX-RS Servlet</servlet-name>
  <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
  <init-param>
    <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
    <param-value>true</param-value>
  </init-param>
  <init-param>
    <param-name>com.sun.jersey.spi.container.ContainerResponseFilters</param-name>
    <param-value>com.your.package.CORSResponseFilter</param-value>
  </init-param>
  <init-param>
    <param-name>com.sun.jersey.config.property.packages</param-name>
    <param-value>com.your.package</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
  <servlet-name>JAX-RS Servlet</servlet-name>
  <url-pattern>/ws/*</url-pattern>
</servlet-mapping>

下面是CORSResponseFilter的代码

import com.sun.jersey.spi.container.ContainerRequest;
import com.sun.jersey.spi.container.ContainerResponse;
import com.sun.jersey.spi.container.ContainerResponseFilter;


public class CORSResponseFilter implements ContainerResponseFilter{

    @Override
    public ContainerResponse filter(ContainerRequest request,
            ContainerResponse response) {
        
        String[] allowDomain = {"http://localhost:9000","https://my.domain.example"};
        Set<String> allowedOrigins = new HashSet<String>(Arrays.asList (allowDomain));                  
        
        String originHeader = request.getHeaderValue("Origin");
        
        if(allowedOrigins.contains(originHeader)) {
            response.getHttpHeaders().add("Access-Control-Allow-Origin", originHeader);
                        
            response.getHttpHeaders().add("Access-Control-Allow-Headers",
                    "origin, content-type, accept, authorization");
            response.getHttpHeaders().add("Access-Control-Allow-Credentials", "true");
            response.getHttpHeaders().add("Access-Control-Allow-Methods",
                    "GET, POST, PUT, DELETE, OPTIONS, HEAD");
        }
        
        return response;
    }
}

对于多个域，在你的。htaccess:

<IfModule mod_headers.c>
    SetEnvIf Origin "http(s)?://(www\.)?(domain1.example|domain2.example)$" AccessControlAllowOrigin=$0$1
    Header add Access-Control-Allow-Origin %{AccessControlAllowOrigin}e env=AccessControlAllowOrigin
    Header set Access-Control-Allow-Credentials true
</IfModule>

Django中还有一个答案。要让一个视图允许来自多个域的CORS，以下是我的代码:

def my_view(request):
    if 'HTTP_ORIGIN' in request.META.keys() and request.META['HTTP_ORIGIN'] in ['http://allowed-unsecure-domain.com', 'https://allowed-secure-domain.com', ...]:
        response = my_view_response() # Create your desired response data: JsonResponse, HttpResponse...
        # Then add CORS headers for access from delivery
        response["Access-Control-Allow-Origin"] = request.META['HTTP_ORIGIN']
        response["Access-Control-Allow-Methods"] = "GET" # "GET, POST, PUT, DELETE, OPTIONS, HEAD"
        response["Access-Control-Max-Age"] = "1000"  
        response["Access-Control-Allow-Headers"] = "*"  
        return response