java - 如何从另一个来源访问 url？即使存在 Access-Control-Allow-* header ，预检请求也会返回 401

Question

我在嵌入式 jetty 中运行简单的 Jersey REST 端点，并进行基本身份验证，并尝试通过其他 Web 应用程序的 ajax 调用来访问它。但即使存在 Access-Control-Allow-* header ，我也会在预检请求中收到 401 Unauthorized。

服务器代码:

public final class RESTServerStarter {
private static final int WEB_SERVER_PORT = 8888;

public static void main(String[] args) throws Exception {
    final ServletHolder sh = new ServletHolder(ServletContainer.class);
    sh.setInitParameter(ServletContainer.RESOURCE_CONFIG_CLASS, PackagesResourceConfig.class.getCanonicalName());
    sh.setInitParameter(PackagesResourceConfig.PROPERTY_PACKAGES, HelloRESTService.class.getPackage().getName());

    final ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
    context.setSecurityHandler(basicAuth("admin", "adminpwd", "Private!"));
    context.setContextPath("/rest");
    context.addServlet(sh, "/*");
    context.addFilter(MyFilter.class, "/*", EnumSet.of(DispatcherType.REQUEST));

    final Server server = new Server();

    final ServerConnector connector = new ServerConnector(server);
    connector.setHost("172.18.133.20");
    connector.setPort(WEB_SERVER_PORT);
    server.addConnector(connector);

    server.setHandler(context);

    try {
        server.start();
        server.join();
    } finally {
        server.destroy();
    }

}

private static final SecurityHandler basicAuth(String username, String password, String realm) {

    HashLoginService hashLoginService = new HashLoginService();
    hashLoginService.putUser(username, Credential.getCredential(password), new String[]{"user"});
    hashLoginService.setName(realm);

    Constraint constraint = new Constraint();
    constraint.setName(Constraint.__BASIC_AUTH);
    constraint.setRoles(new String[]{"user"});
    constraint.setAuthenticate(true);

    ConstraintMapping cm = new ConstraintMapping();
    cm.setConstraint(constraint);
    cm.setPathSpec("/*");

    ConstraintSecurityHandler csh = new ConstraintSecurityHandler();
    csh.setAuthenticator(new BasicAuthenticator());
    csh.setRealmName("myrealm");
    csh.addConstraintMapping(cm);
    csh.setLoginService(hashLoginService);

    return csh;

}

public static final class MyFilter implements Filter {
    public void init(FilterConfig filterConfig) {
        //nothing to init
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        final HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.addHeader("Access-Control-Allow-Origin", "http://172.18.133.20:" + RESTClientStarter.WEB_SERVER_PORT);
        httpResponse.addHeader("Access-Control-Allow-Methods", "GET, POST, OPTIONS, DELETE, PUT");
        httpResponse.addHeader("Access-Control-Allow-Credentials", "true");
        httpResponse.addHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization");
        chain.doFilter(request, response);
    }

    public void destroy() {
        //nothing to destroy
    }
}

@Path("/test")
public static class HelloRESTService {

    @GET
    @Path("hello")
    @Produces(MediaType.TEXT_PLAIN)
    public String hello() {
        return "hello";
    }
}

}

客户端代码:

$(function(){
    $.ajax({
        url : "http://172.18.133.20:8888/rest/test/hello",
        type : "GET",
        timeout : 120000,
        async : true,
        xhrFields: {
            withCredentials: true
        },
        crossDomain: true,
        headers: {
            "Authorization": "Basic " + btoa("admin:adminpwd")
        },
        error: function(xhr, status, error) {
            $("#container").text(error);
        },
        success: function(xhr) {
            $("#container").text(xhr);
        }
    });
});

客户端代码运行于 http://172.18.133.20:9999

以下是完整来源:

https://bitbucket.org/dmitry_apanasevich/cors/src

你能告诉我出了什么问题吗？

感谢您的提前!

Answer 1

我已经解决了从 SecurityMapping 排除 OPTIONS 请求的问题。只需添加一行:

...
ConstraintMapping cm = new ConstraintMapping();
cm.setMethod("GET"); //new line
cm.setConstraint(constraint);
cm.setPathSpec("/*");
...