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Re: [jetty-users] Cannot get org.eclipse.jetty.server.Request instance
On Tue, Sep 10, 2019 at 7:50 PM Simone Bordet <sbordet@xxxxxxxxxxx> wrote:
Hi,

On Tue, Sep 10, 2019 at 1:41 PM John Jiang <john.sha.jiang@xxxxxxxxx> wrote:
>
> I wanted to test the HTTP/2 feature server push with Jetty 9.4.20, and made a simple servlet like the below,
>
> public class ServerPushServlet extends HttpServlet {
>
>     protected void doGet(HttpServletRequest request,
>             HttpServletResponse response) throws ServletException, IOException {
>             Request req = Request.getBaseRequest(request);
>             System.out.println("req: " + req);
>             PushBuilder pushBuilder = req.getPushBuilder();
>             pushBuilder.path("/res").push();
>     }
> }
>
> When tried to access http://localhost:port/push with FireFox, the following error raised,
> req: null
> 2019-09-10 16:21:58.906:WARN:oejs.HttpChannel:qtp1793329556-11: /push
> java.lang.NullPointerException
> at httptest.ServerPushServlet.push(Unknown Source)

The problem is that

request.getPushBuilder()

return null if push is not supported.

This happens because you are making the request using HTTP/1.1 as
browsers don't support HTTP/2 if it's not encrypted.
You should try https instead of http.

I would have tried that with curl, like the below,
$ curl -v --http2 http://localhost:9020/push
*   Trying ::1:9020...
* TCP_NODELAY set
* Connected to localhost (::1) port 9020 (#0)
> GET /push HTTP/1.1
> Host: localhost:9020
> User-Agent: curl/7.65.3
> Accept: */*
> Connection: Upgrade, HTTP2-Settings
> Upgrade: h2c
> HTTP2-Settings: AAMAAABkAARAAAAAAAIAAAAA
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 101 Switching Protocols
* Received 101
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Connection state changed (MAX_CONCURRENT_STREAMS == 1024)!
< HTTP/2 500
< cache-control: must-revalidate,no-cache,no-store
< content-type: text/html;charset=iso-8859-1
<
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<title>Error 500 Server Error</title>
</head>
<body><h2>HTTP ERROR 500</h2>
<p>Problem accessing /push. Reason:
<pre>    Server Error</pre></p><h3>Caused by:</h3><pre>java.lang.NullPointerException
at httptest.ServerPushServlet.doGet(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:844)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
...

I think they talked HTTP/2.
And I suppose this issue may not related to HTTP/2. If used HTTP/1.1, that Request still was null.

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