GET请求被禁止，而POST请求则可以正常运行

Question

在我的web应用程序中，我需要调用不同的web服务（由我开发/管理），以通过rest API启动/管理资源。Web服务在tomcat6上运行。我可以从浏览器日志中看到POST请求正在通过，但GET请求被禁止。如果我从web服务本身进行相同的调用，那么我没有看到任何问题。我已经为tomcat6定义了跨源过滤器，并在支持的方法中提到了GET，但问题仍然存在。。

我已经在应用程序服务器级别的web.xml中以这种方式定义了跨源过滤器。我使用的CORS过滤器库来自http://software.dzhuvinov.com/cors-filter.html.这是一个tomcat6服务器，过滤器已在（$tomcat6_HOME/conf/web.xml）中定义如下

<filter>
    <filter-name>CORS</filter-name>
    <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>
    <init-param>
     <param-name>cors.allowOrigin</param-name>
        <param-value>*</param-value>
    </init-param>
    <init-param>
     <param-name>cors.supportedMethods</param-name>
        <param-value>GET, POST, HEAD, PUT, DELETE, OPTIONS</param-value>
    </init-param>
    <init-param>
     <param-name>cors.supportedHeaders</param-name>
     <param-value>*</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>CORS</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

奇怪的是，Web服务接受POST调用，但对于GET调用，它抛出403-Forbidden错误，告诉"已禁止访问指定资源"。

GET调用的标头如下

Request URL:https://remote.vm.mycompany.com/remote/tunnel?read:c2faeb31-4147-49e8-b8d3-53d89496e5ca:0
Request Method:GET
Status Code:403 Forbidden
Request Headersview source
Accept:*/*
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8
Connection:keep-alive
Host:remote.vm.mycompany.com
Origin:https://ec2-184-72-200-91.compute-1.amazonaws.com
Referer:https://ec2-184-72-200-91.compute-1.amazonaws.com/
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.71 Safari/537.36
Query String Parametersview sourceview URL encoded
read:c2faeb31-4147-49e8-b8d3-53d89496e5ca:0:
Response Headersview source
Access-Control-Allow-Credentials:true
Access-Control-Allow-Origin:https://ec2-184-72-200-91.compute-1.amazonaws.com
Content-Length:961
Content-Type:text/html;charset=utf-8
Date:Sun, 21 Jul 2013 17:17:37 GMT
Server:Apache-Coyote/1.1

Tomcat访问日志还显示GET请求已被禁止，但在的任何日志中都没有给出任何线索

- - - [21/Jul/2013:17:17:37 +0000] POST /remote/tunnel?connect HTTP/1.1 200   -
- - - [21/Jul/2013:17:17:37 +0000] GET /remote/tunnel?read:c2faeb31-4147-49e8-b8d3-53d89496e5ca:0 HTTP/1.1 403   -

这是我的servlet代码。我正在尝试集成鳄梨酱（HTML5VNC客户端即Web服务）

package com.mycompany.html5remote;
import java.util.Arrays;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import net.sourceforge.guacamole.GuacamoleException;
import net.sourceforge.guacamole.net.GuacamoleSocket;
import net.sourceforge.guacamole.net.GuacamoleTunnel;
import net.sourceforge.guacamole.net.InetGuacamoleSocket;
import net.sourceforge.guacamole.protocol.ConfiguredGuacamoleSocket;
import net.sourceforge.guacamole.protocol.GuacamoleClientInformation;
import net.sourceforge.guacamole.protocol.GuacamoleConfiguration;
import net.sourceforge.guacamole.servlet.GuacamoleHTTPTunnelServlet;
import net.sourceforge.guacamole.servlet.GuacamoleSession;
public class HttpTunnel extends GuacamoleHTTPTunnelServlet {
    private Logger logger = LoggerFactory.getLogger(HttpTunnel.class);
    @Override
    protected GuacamoleTunnel doConnect(HttpServletRequest request) throws GuacamoleException {
        HttpSession httpSession = request.getSession(true);
        logger.info("Inside doConnect Method.");

        GuacamoleClientInformation info = new GuacamoleClientInformation();
        String hostname = request.getParameter("hostname");
        String protocol = request.getParameter("protocol");
        // Create socket
        GuacamoleConfiguration config = new GuacamoleConfiguration();
        config.setProtocol(protocol);
        config.setParameter("hostname", hostname);
        //config.setParameter("hostname", "ec2-184-73-104-108.compute-1.amazonaws.com");
        if("vnc".equals(protocol)){
            config.setParameter("port", "5901");
        }else if ("rdp".equals(protocol)){
            config.setParameter("port", "3389");
        }else{
            config.setParameter("port", "22");
        }
        logger.info("Set the configuration. Creating the socket connection now..");
        // Return connected socket
        GuacamoleSocket socket =  new ConfiguredGuacamoleSocket(
                new InetGuacamoleSocket("localhost", 4822),
                config, info
        );
        logger.info("Successfully created socket connection.");

        // Create tunnel from now-configured socket
        GuacamoleTunnel tunnel = new GuacamoleTunnel(socket);
        // Attach tunnel
        GuacamoleSession session = new GuacamoleSession(httpSession);
        session.attachTunnel(tunnel);
        logger.info("Done");
        return tunnel;
    }
}

GuacamoleHTTPTunnelServlet（GPL许可）的文档在这里

我可能错过了什么？还有其他地方我可以寻找线索吗？请帮助

Answer 1

您是否有任何与web.xml中配置的http方法相关的安全约束？我不确定你为什么选择一个单独的api来过滤你的请求？

Answer 2

我花了几天时间试图将我的Spring Boot与Apache Guacamole后端连接到我的NextJS前端，下面是适用于我的解决方案（参考StackOverflow上的这个问题）：

问题有两个主要部分，CORS和CSRF。首先，创建一个新的Java类，并使用Guacamole所需的头和方法以及前端服务器的来源等内容设置CORS配置。这确保了Spring Boot服务器将使用正确的CORS头来响应来自前端的请求，这样它就不会被浏览器阻止。

@Bean
CorsConfigurationSource corsConfigurationSource() {
    CorsConfiguration configuration = new CorsConfiguration();
    configuration.setAllowedOrigins(Arrays.asList("http://localhost:3000"));
    configuration.setAllowedMethods(Arrays.asList("*"));
    configuration.setAllowedHeaders(Arrays.asList("*"));
    configuration.setAllowCredentials(true);
    configuration.setExposedHeaders(Arrays.asList("Guacamole-Status-Code", "Guacamole-Error-Message", "Guacamole-Tunnel-Token"));
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    source.registerCorsConfiguration("/**", configuration);
    return source;
}

其次，在正确的CORS配置下，POST请求以"0"结束/地下通道"连接"；但是随后的GET请求以"0"结尾/地下通道读：一些数字和文本：0"；仍将被阻止。这就是CSRF的作用所在，因为由于Spring Security的默认CSRF保护，请求可能被拒绝。因此，只需创建一个新的SecurityFilterChain并指定行"；http.cors（）.and（）.csrf（）.disable（）&"；，禁用CSRF（您可以稍后对此进行配置）。POST请求将被接受，并且可以启动Apache Guacamole隧道。

@Bean
public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
    // Adds a CorsFilter to be used. If a bean by the name of corsFilter is provided, that CorsFilter is used. 
    // Else if corsConfigurationSource is defined, then that CorsConfiguration is used.
    http.cors().and().csrf().disable();
    return http.build();
}

以下是完整的Java类：

@Configuration
@EnableWebSecurity
public class WebSecurityConfig {
    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        // Adds a CorsFilter to be used. If a bean by the name of corsFilter is provided, that CorsFilter is used. 
        // Else if corsConfigurationSource is defined, then that CorsConfiguration is used.
        http.cors().and().csrf().disable();
        return http.build();
    }
    @Bean
    CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(Arrays.asList("http://localhost:3000"));
        configuration.setAllowedMethods(Arrays.asList("*"));
        configuration.setAllowedHeaders(Arrays.asList("*"));
        configuration.setAllowCredentials(true);
        configuration.setExposedHeaders(Arrays.asList("Guacamole-Status-Code", "Guacamole-Error-Message", "Guacamole-Tunnel-Token"));
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }
}