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[Tim Andersson <2061816@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

We (autopkgtest.ubuntu.com) had an unattended upgrade recently bump our
apache version to 2.4.41-4ubuntu3.17.

This was problematic for us - we serve static files through apache and
seemingly after this version bump, our transfer encodings are now ALWAYS
set to be "chunked".

This is an issue, as we have external services which periodically
download these static files I've mentioned, which need to check the
Content-Length header whilst downloading these files.

I've manually installed 2.4.41-4ubuntu3.16 on our staging servers and
verified that this patch is indeed the root cause of the issue.

with 2.4.41-4ubuntu3.16:
```
 wget -v -d https://autopkgtest.staging.ubuntu.com/static/autopkgtest.db
...
---request begin---
GET /static/autopkgtest.db HTTP/1.1
Host: autopkgtest.staging.ubuntu.com
User-Agent: Wget/1.21.3
Accept: */*
Accept-Encoding: identity
Connection: Keep-Alive

---request end---
HTTP request sent, awaiting response... w
---response begin---
HTTP/1.1 200 OK
date: Tue, 16 Apr 2024 10:15:41 GMT
server: Apache/2.4.41 (Ubuntu)
cache-control: public, max-age=60
expires: Tue, 16 Apr 2024 10:16:41 GMT
accept-ranges: bytes
content-length: 1434976256
last-modified: Tue, 16 Apr 2024 10:14:27 GMT
etag: "1713262467.7848494-1434976256-79961951"
content-type: application/octet-stream
set-cookie: SRVNAME=S0; path=/

---response end---
200 OK

Stored cookie autopkgtest.staging.ubuntu.com -1 (ANY) / <session> <insecure> [expiry none] SRVNAME S0
Registered socket 3 for persistent reuse.
Length: 1434976256 (1.3G) [application/octet-stream]
Saving to: ‘autopkgtest.db’
```

with 2.4.41-4ubuntu3.17:
```
---request begin---
GET /static/autopkgtest.db HTTP/1.1
Host: autopkgtest.staging.ubuntu.com
User-Agent: Wget/1.21.3
Accept: */*
Accept-Encoding: identity
Connection: Keep-Alive

---request end---
HTTP request sent, awaiting response... 
---response begin---
HTTP/1.1 200 OK
date: Tue, 16 Apr 2024 10:23:50 GMT
server: Apache/2.4.41 (Ubuntu)
cache-control: public, max-age=60
expires: Tue, 16 Apr 2024 10:24:51 GMT
accept-ranges: bytes
last-modified: Tue, 16 Apr 2024 10:23:27 GMT
etag: "1713263007.8384898-1434976256-79961951"
transfer-encoding: chunked
content-type: application/octet-stream
set-cookie: SRVNAME=S0; path=/

---response end---
200 OK

Stored cookie autopkgtest.staging.ubuntu.com -1 (ANY) / <session> <insecure> [expiry none] SRVNAME S0
Registered socket 3 for persistent reuse.
Length: unspecified [application/octet-stream]
Saving to: ‘autopkgtest.db’
```

And you can clearly see the content length isn't reported.

Is this the intended behaviour? Are there ways I can workaround this to
not use chunked transfer encoding?

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

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https://bugs.launchpad.net/bugs/2061816

Title:
  apache2 2.4.41-4ubuntu3.17 defaults to transfer-encoding=chunked where
  this is undesired

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