HTTP 代理 Servlet 错误

Question

首先让我说这是昨天的工作，所以我完全不明白为什么它突然停止工作。而且Java / 插件真的不是我的专长

我正在开发一个应用程序，可以对另一个域上的服务器进行 POST 和 GET 调用。这是一个 Maven 项目。为了避免跨源问题，我有一个 httpproxy.ProxyServlet 插件。

我将在这里列出所有的工作部分，但问题和错误基本上总结在这个 post.

的底部

pom.xml

<dependencies>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.mitre.dsmiley.httpproxy</groupId>
        <artifactId>smiley-http-proxy-servlet</artifactId>
        <version>1.6</version>
    </dependency>

</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.0.2</version>
            <configuration>
                <source>1.5</source>
                <target>1.5</target>
            </configuration>
        </plugin>
        <!--        War plugin below is required for above plugin to build project without errors.    
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.1.1</version>
        </plugin>
    </plugins>

web.xml

第二个 servlet 部分是有问题的部分。我只 post 第一个，因为第一个工作正常。供参考。

<servlet>
    <servlet-name>ad_auth</servlet-name>
    <servlet-class>org.mitre.dsmiley.httpproxy.ProxyServlet</servlet-class>
    <init-param>
        <param-name>targetUri</param-name>
        <param-value>${authserver}/aaenroll/rest/authContext</param-value>
    </init-param>
    <init-param>
        <param-name>log</param-name>
        <param-value>true</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>ad_auth</servlet-name>
    <url-pattern>/adauth</url-pattern>
</servlet-mapping>


<servlet>
    <servlet-name>user_profile</servlet-name>
    <servlet-class>org.mitre.dsmiley.httpproxy.ProxyServlet</servlet-class>
    <init-param>
        <param-name>targetUri</param-name>
        <param-value>${authserver}/aaenroll/rest/userProfile/userName/{_username}.json?user={_username}</param-value>
        <!--<param-value>${authserver}/aaenroll/rest/userProfile/userName/segotac.json?user=segotac</param-value>-->
    </init-param>
    <init-param>
        <param-name>log</param-name>
        <param-value>true</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>user_profile</servlet-name>
    <url-pattern>/userProfile</url-pattern>
</servlet-mapping>

Java脚本Ajax调用

function checkEnrollment() {
var username = Cookies.get('username');
var authToken = Cookies.get('authToken');
$.ajax({
    type: "GET",
    beforeSend: function(request)
    {
        request.setRequestHeader("Authorization", authToken);
    },
    url: "userProfile?_username=" + username, //**PROBLEM HERE** -> Url intercepted by servlet plugin. Full path mapping is available in web.xml. As per the Plugin syntax, param _username will replace all "{_username}" in web.xml userProfile targetUri param-values.
    success: function(msg, success) {
        window.location.replace("enroll.jsp");
    },
    error: function(xhr, ajaxOptions, thrownError) {
        console.log('false Enrollment');
    }
});

上面传入的截获 URL 的语法位于此 link 的底部。哪个是插件。这又是……昨天还在工作……https://github.com/mitre/HTTP-Proxy-Servlet

终于到了。错误：

<html><head><title>Apache Tomcat/7.0.39 - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - Trying to process targetUri init parameter: java.net.URISyntaxException: Illegal character in path at index 71: http://cslxintwebdev3.csmc.edu:8087/aaenroll/rest/userProfile/userName/{_username}.json?user={_username}</h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u>Trying to process targetUri init parameter: java.net.URISyntaxException: Illegal character in path at index 71: http://cslxintwebdev3.csmc.edu:8087/aaenroll/rest/userProfile/userName/{_username}.json?user={_username}</u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>javax.servlet.ServletException: Trying to process targetUri init parameter: java.net.URISyntaxException: Illegal character in path at index 71: http://cslxintwebdev3.csmc.edu:8087/aaenroll/rest/userProfile/userName/{_username}.json?user={_username}
org.mitre.dsmiley.httpproxy.ProxyServlet.initTarget(ProxyServlet.java:156)
org.mitre.dsmiley.httpproxy.ProxyServlet.init(ProxyServlet.java:140)
javax.servlet.GenericServlet.init(GenericServlet.java:160)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
java.lang.Thread.run(Thread.java:722)

根本原因

java.net.URISyntaxException: Illegal character in path at index 71: http://example.com:8087/aaenroll/rest/userProfile/userName/{_username}.json?user={_username}
    java.net.URI$Parser.fail(URI.java:2829)
    java.net.URI$Parser.checkChars(URI.java:3002)
    java.net.URI$Parser.parseHierarchical(URI.java:3086)
    java.net.URI$Parser.parse(URI.java:3034)
    java.net.URI.<init>(URI.java:595)
    org.mitre.dsmiley.httpproxy.ProxyServlet.initTarget(ProxyServlet.java:154)
    org.mitre.dsmiley.httpproxy.ProxyServlet.init(ProxyServlet.java:140)
    javax.servlet.GenericServlet.init(GenericServlet.java:160)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    java.lang.Thread.run(Thread.java:722)

注意 Apache Tomcat/7.0.39 日志中提供了根本原因的完整堆栈跟踪。

Apache Tomcat/7.0.39

所以简短的问题是，为什么发送到 HttpProxy 插件的用户名参数没有被正确拦截和替换？

很抱歉，如果要提供的信息太多了。希望熟悉这些技术的人能够快速识别问题或为我指出正确的调试路径。

谢谢！

编辑

web.xml

<servlet-class>org.mitre.dsmiley.httpproxy.URITemplateProxyServlet</servlet-class>
<url-pattern>/userProfile/*</url-pattern>

js

url: "userProfile?_username=" + username,

错误：

HTTP Status 500 - Missing HTTP parameter _username to fill the template

我知道用户名在 javascript 调用中有一个值。变量未正确应用于 web.xml

中的模板

再次感谢！

Answer 1

主要是你的servlet映射有问题。根据 documentation，我没有看到任何迹象表明 class ProxyServlet 允许参数化（尽管可能允许）。也许您应该改用 class URITemplateProxyServlet。您可以这样更改您的 servlet 定义：

<servlet-class>org.mitre.dsmiley.httpproxy.URITemplateProxyServlet</servlet-class>
<init-param>
    <param-name>targetUri</param-name>
    <param-value>{authserver}/aaenroll/rest/userProfile/userName/{_username}.json?user={_username}</param-value>
    ...

和这样的 servlet 映射（注意 '*'）：

<servlet-mapping>
  <servlet-name>user_profile</servlet-name>
  <url-pattern>/userProfile/*</url-pattern>
</servlet-mapping>

然后在你的 ajax:

...
url: "userProfile/?authserver=" + authserver + "&_username=" + username;
...

所以我正在为 URITemplateProxyServlet 阅读 the source，我认为它可能需要一对一的参数匹配。换句话说，对于 targetUri 中的每个参数，查询字符串中必须有一个匹配的参数（即 URL 你的 ajax 生成）。不幸的是我无法测试，但你应该能够快速判断这是否是事实。

试试这个：

为了避免混淆，将 url 模式设置为具有第二个 '/' <url-pattern>/userProfile/*</url-pattern>，就像他们的 documentation 一样。
更改 ajax 生成的 URL 以匹配此模式 AND 有第二个参数："userProfile/subpath?_username=" + username + "&_username2=" + username;
根据需要更改目标 uri：<param-value>${authserver}/aaenroll/rest/userProfile/userName/{_username}.json?user={_username2}</param-value>

Answer 2

好吧，我终于弄明白问题出在哪里了。由于我试图使用相同的 _username 参数来填充我的 targetUri 中的两个位置，因此其中一个位置丢失了。基本上你不能使用这个插件将相同的参数应用到 targetUri 两次。

解决方法： web.xml

<servlet>
    <servlet-name>user_profile</servlet-name>
    <servlet-class>org.mitre.dsmiley.httpproxy.URITemplateProxyServlet</servlet-class>
    <init-param>
        <param-name>targetUri</param-name>
        <param-value>${authserver}/aaenroll/rest/userProfile/userName/{_username}.json?user={_username2}</param-value>
    </init-param>
    <init-param>
        <param-name>log</param-name>
        <param-value>true</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>user_profile</servlet-name>
    <url-pattern>/userProfile/*</url-pattern>
</servlet-mapping>

ajax 通话

$.ajax({
    type: "GET",
    beforeSend: function(request)
    {
        request.setRequestHeader("Authorization", authToken);
    },
    url: "userProfile?_username=" + username + "&_username2=" + username;, //Url intercepted by servlet plugin. Full path mapping is available in web.xml
    success: function(msg, success) {
    },
    error: function(xhr, ajaxOptions, thrownError) {
    }
});

HTTP 代理 Servlet 错误

HTTP Proxy Servlet Error

java

proxy

tomcat

servlets

maven

Apache Tomcat/7.0.39