我正在使用dropwizard应用程序和js ui与api进行交互。我需要加载json数据以更新视图,但在此之前我必须在dropwizard中启用cors。我做了一些工作人员,但似乎无法正常工作,因为dropwizard始终返回204,没有内容。
@Override
public void run(final BGConfiguration configuration, final Environment environment) throws Exception {
final Map<String, String> params = new HashMap<>();
params.put("Access-Control-Allow-Origin", "/*");
params.put("Access-Control-Allow-Credentials", "true");
params.put("Access-Control-Expose-Headers", "true");
params.put("Access-Control-Allow-Headers", "Content-Type, X-Requested-With");
params.put("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
environment.servlets().addFilter("cors", CrossOriginFilter.class).setInitParameters(params);
}
这里的错误是尚未通过addMappingForUrlPatterns
方法为过滤器配置URL路径。
这使用dropwizard 0.7.1对我有用:
import org.eclipse.jetty.servlets.CrossOriginFilter;
import javax.servlet.DispatcherType;
import java.util.EnumSet;
public void run(Configuration conf, Environment environment) {
// Enable CORS headers
final FilterRegistration.Dynamic cors =
environment.servlets().addFilter("CORS", CrossOriginFilter.class);
// Configure CORS parameters
cors.setInitParameter("allowedOrigins", "*");
cors.setInitParameter("allowedHeaders", "X-Requested-With,Content-Type,Accept,Origin");
cors.setInitParameter("allowedMethods", "OPTIONS,GET,PUT,POST,DELETE,HEAD");
// Add URL mapping
cors.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class), true, "/*");
}
我假设您正在浏览器中对此进行实时测试,但是您可以使用CLI这样的curl命令通过CLI进行验证:
$ curl -H "Origin: http://example.com" \
-H "Access-Control-Request-Method: POST" \
-H "Access-Control-Request-Headers: X-Requested-With" \
-X OPTIONS --verbose \
http://localhost:8080
您应该在响应中看到一堆Access-Control-*
HTTP标头。
[添加到Mike Clarke的答案:
将CHAIN_PREFLIGHT_PARAM
设置为false将使此过滤器处理预检请求,而您的身份验证过滤器不会截获200
响应并将其转变为未授权/禁止。
import org.eclipse.jetty.servlets.CrossOriginFilter;
import javax.servlet.DispatcherType;
import java.util.EnumSet;
public void run(Configuration conf, Environment environment) {
// Enable CORS headers
final FilterRegistration.Dynamic cors =
environment.servlets().addFilter("CORS", CrossOriginFilter.class);
// Configure CORS parameters
cors.setInitParameter("allowedOrigins", "*");
cors.setInitParameter("allowedHeaders", "X-Requested-With,Content-Type,Accept,Origin");
cors.setInitParameter("allowedMethods", "OPTIONS,GET,PUT,POST,DELETE,HEAD");
// Add URL mapping
cors.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class), true, "/*");
// DO NOT pass a preflight request to down-stream auth filters
// unauthenticated preflight requests should be permitted by spec
cors.setInitParameter(CrossOriginFilter.CHAIN_PREFLIGHT_PARAM, Boolean.FALSE.toString());
}
令我惊讶的是,我没有在包含此配置的互连网上找到任何示例。花了几天时间试图解决这个问题。
对我来说,即使配置了上述内容,它也不起作用。最终,事实证明我还必须允许缓存控制标头。
filter.setInitParameter("allowedHeaders",
"Cache-Control,If-Modified-Since,Pragma,Content-Type,Authorization,X-Requested-With,Content-Length,Accept,Origin");
您可以尝试这样做:
final FilterRegistration.Dynamic cors =
environment.servlets().addFilter("CORS", CrossOriginFilter.class);
// Configure CORS parameters
// Configure CORS parameters
cors.setInitParameter("allowedOrigins", "*");
cors.setInitParameter("allowedHeaders", “<Headers>”);
cors.setInitParameter("allowedMethods", "OPTIONS,GET,PUT,POST,");
// Add URL mapping
cors.addMappingForUrlPatterns(EnumSet.allOf(DispatcherType.class), true, "/*");