Comment # 7 on bug 1226217 from Dirk Stoecker

Here a short test script showing both issues:

#!/usr/bin/perl

print "Status: 200 OK\r\n";
print "Transfer-Encoding: chunked\r\n";
print "Content-Length: 3\r\n";
print "\r\n";
print "3\r\n";
print "---\r\n";
print "0\r\n";
print "\r\n";

Error (curl -vv, stripped private info)
> GET /cgi-bin/error.cgi HTTP/1.1
> User-Agent: curl/8.8.0
> Accept: */*
> 
* Request completely sent off
< HTTP/1.1 200 OK
< Date: Thu, 13 Jun 2024 08:53:37 GMT
< Server: Apache
< Transfer-Encoding: chunked
< Content-Type: application/x-cgi
< 
3
---
0

--- in tcpdump the double encoding is visible better:
MHTTP/1.1 200 OK
Date: Thu, 13 Jun 2024 08:45:23 GMT
Server: Apache
Transfer-Encoding: chunked
Content-Type: application/x-cgi

8
3
---


0

Ok:
> GET /cgi-bin/error.cgi HTTP/1.1
> User-Agent: curl/8.8.0
> Accept: */*
> 
* Request completely sent off
< HTTP/1.1 200 OK
< Date: Thu, 13 Jun 2024 08:54:09 GMT
< Server: Apache
< Transfer-Encoding: chunked
< Content-Length: 3
< Content-Type: application/x-cgi
< 
* Connection #0 to host a07upload.gnssonline.eu left intact
---


It SHOULD send content length header and not do transfer encoding different to
the script (i.e. when script has no transfer encoding, the output also
shouldn't - not tested in this example).