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[Bug 1874932] [NEW] Getting old buffer + header + correct response

To: enterprise-support@xxxxxxxxxxxxxxxxxxx
From: Sjef Bosman <1874932@xxxxxxxxxxxxxxxxxx>
Date: Fri, 24 Apr 2020 22:55:05 -0000
Reply-to: Bug 1874932 <1874932@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

UBUNTU RELEASE
Description:	Ubuntu 16.04.3 LTS
Release:	16.04

APACHE2 VERSION
apache2:
  Installed: 2.4.18-2ubuntu3.14
  Candidate: 2.4.18-2ubuntu3.14
  Version table:
 *** 2.4.18-2ubuntu3.14 500
        500 http://ubuntu.apt-get.eu/ubuntu xenial-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2.4.18-2ubuntu3.13 500
        500 http://security.ubuntu.apt-get.eu/ubuntu xenial-security/main amd64 Packages
     2.4.18-2ubuntu3 500
        500 http://ubuntu.apt-get.eu/ubuntu xenial/main amd64 Packages

WHAT I EXPECT TO HAPPEN
That a correct response is sent back, see below.

WHAT ACTUALLY HAPPENS
We have apache2 as a reverse proxy server, doing a lot of things: 4 Virtual Hosts, several RewriteRules, SSL to a non-SSL internal (Domino) server, quite some ProxyPass* lines, and a few Substitutes to fix links in returned HTML. 

In 98% of all cases everything works, only, in 2% of the page requests
the browser gets the wrong response: it contains the homepage html, then
the header for the actual response, and then the correct response.

Here an extract of the middle part of the returned response, where two buffers seem to be joined:
-----------------------------
XSP.addOnLoad(function() {
XSP.attachEvent("view:_id1:_id2:_id3:_id9:_id10:5:_id26:_id28:_id30", "view:_id1:_id2:_id3:_id9:_id10:5:_id26:_id28:query", "onkeydown", view__id1__id2__id3__id9__id10_5__id26__id28__id30_clientSide_onkeydown, false, 2);
XSP.attachEvent("view:_id1:_id2:_id3:_id9:_id10:5:_id26:_id28:_id31", "view:_id1:_id2:_id3:_id9:_id10:5:_id26:_id28:btnSearch", "onclick", view__id1__id2__id3__id9__id10_5__id26__id28__id31_clientSide_onclick, false, 0);
XSP.attachEvent("view:_id1:_id2:_id3:_id9:_id10:6:_id34:_id36:_id38", "view:_id1:_id2:_id3:_id9:_id10:6:_id34:_id36:image1", "onclick", view__id1__id2__id3__id9__id10_6__id34__id36__id38_clientSide_onclick, false, 2);
}); 

</script>
</body>
</html>HTTP/1.1 200 OK

Date: Fri, 24 Apr 2020 22:03:21 GMT

Content-Type: text/html;charset=UTF-8

Expires: -1

Content-Length: 72703


<!DOCTYPE html>
<html lang="en">
<head>
<base href="//www.website.nl/TA.nsf/Page.xsp/">
<title>Website</title>
<link rel="SHORTCUT ICON" href="/website.nsf/images/favicon.ico/%24file/favicon.ico">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=4.0, user-scalable=yes">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Rubik"; src="" type=""></link>
<meta name="Description" content="info">
<link rel="stylesheet" type="text/css" href="/xsp/.ibmxspres/.mini/css-1.9.7/@Da&amp;@Ib&amp;2Tfxsp.css&amp;2TfxspLTR.css&amp;2TfxspFF.css.css">
-----------------------------

The output comes from one single line in the Firefox 75.0 Developer
Tools window, on the Network tab.

The same happens every now and then on a page that regularly refreshes
an image on the screen. Usually (98%) the response is correct, but
sometimes two responses are combined into one and then the browser
flips.

Needless to say maybe, but if I access the website directly, i.e. not
through the proxy server, there's no problem whatsoever, the response is
always correct.

Thank you for looking into this. If you need more info, please contact
me by mail.

** Affects: apache2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1874932

Title:
  Getting old buffer + header + correct response

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