Java tomcat未发送请求的http头_Java_Tomcat_Http Headers

Java tomcat未发送请求的http头

java tomcat

Java tomcat未发送请求的http头,java,tomcat,http-headers,Java,Tomcat,Http Headers,我在tomcat/webapps目录下部署了一个servlet，我试图向它发送curl请求： $~ curl -v http://localhost:8080/ * About to connect() to localhost port 8080 (#0) * Trying 127.0.0.1... * Adding handle: conn: 0x33e0ee0 * Adding handle: send: 0 * Adding handle: recv: 0 * Curl_addH

我在

tomcat/webapps

目录下部署了一个

servlet

，我试图向它发送

curl

请求：

 $~ curl -v http://localhost:8080/

* About to connect() to localhost port 8080 (#0)
*   Trying 127.0.0.1...
* Adding handle: conn: 0x33e0ee0
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
* - Conn 0 (0x33e0ee0) send_pipe: 1, recv_pipe: 0
* Connected to localhost (127.0.0.1) port 8080 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.30.0
> Host: localhost:8080
> Accept: */*
> 
< HTTP/1.1 302 Found
* Server Apache-Coyote/1.1 is not blacklisted
< Server: Apache-Coyote/1.1
< Set-Cookie: JSESSIONID=<ID>; Path=/; HttpOnly
< Location: http://localhost:8080/
< Content-Type: text/html;charset=EUC-KR
< Content-Length: 0
< Date: Mon, 02 Sep 2013 14:24:53 GMT
< 
* Connection #0 to host localhost left intact

但是我得到了

null

，所以如果我试图打印任何标题元素，结果得到

null

。有什么帮助吗？

关于Tomcat 7.0.22，下面的servlet

@WebServlet(urlPatterns = "/vController")
public class vlController extends HttpServlet {    
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse resp) throws ServletException, IOException {
        String host = request.getHeader("Host");
        System.out.println("Host: "+host);
        resp.getWriter().write("host printed");
    }
}

使用

index.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
    <jsp:forward page="/vController" />
    Heello wRoldasdas
</body>
</html>

服务器清晰地打印出来

Host: localhost:8080

在您的例子中，服务器以302响应，因此您的servlet永远不会被命中。我不知道你的

null

头来自哪里

不要使用

cURL

，而是尝试使用Java HTTP客户端，例如Apache的

HttpClient

是否

cURL

发送

Host

头？@SotiriosDelimanolis:我更新了问题。哪个servlet正在尝试获取头？你是用302还是容器来响应？@SotiriosDelimanolis:It's the

my app

servlet作为

tomcat

根目录，我只是执行curl，但在标题中什么也没有。请发布最小化的servlet代码、

web.xml

和应用程序的上下文路径。我们一定遗漏了什么。它命中了servlet，因为我可以在

doGet

方法中获取所有调试消息

是因为

vController

@stsd中的url重定向导致的问题是什么？

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
    <jsp:forward page="/vController" />
    Heello wRoldasdas
</body>
</html>

$ clear; curl -v http://localhost:8080/
* About to connect() to localhost port 8080 (#0)
*   Trying 127.0.0.1...
* 0x60002d0f0 is at send pipe head!
* STATE: CONNECT => WAITCONNECT handle 0x60006cac0; line 1032 (connection #0)
* Connected to localhost (127.0.0.1) port 8080 (#0)
* STATE: WAITCONNECT => DO handle 0x60006cac0; line 1151 (connection #0)
> GET / HTTP/1.1
> User-Agent: curl/7.29.0
> Host: localhost:8080
> Accept: */*
>
* STATE: DO => DO_DONE handle 0x60006cac0; line 1236 (connection #0)
* STATE: DO_DONE => WAITPERFORM handle 0x60006cac0; line 1352 (connection #0)
* STATE: WAITPERFORM => PERFORM handle 0x60006cac0; line 1363 (connection #0)
* HTTP 1.1 or later with persistent connection, pipelining supported
< HTTP/1.1 200 OK
HTTP/1.1 200 OK
< Server: Apache-Coyote/1.1
Server: Apache-Coyote/1.1
< Set-Cookie: JSESSIONID=7694BACEC0C311357E72DCEA7574540A; Path=/; HttpOnly
Set-Cookie: JSESSIONID=7694BACEC0C311357E72DCEA7574540A; Path=/; HttpOnly
< Content-Type: text/html;charset=ISO-8859-1
Content-Type: text/html;charset=ISO-8859-1
< Content-Length: 12
Content-Length: 12
< Date: Mon, 02 Sep 2013 16:40:11 GMT
Date: Mon, 02 Sep 2013 16:40:11 GMT

<
* STATE: PERFORM => DONE handle 0x60006cac0; line 1533 (connection #0)
* Connection #0 to host localhost left intact
host printed

Host: localhost:8080