>Synopsis: relayd gives 4xx errors on backend http protocol errors, but
>should give 5xx
>Category: system
>Environment:
System : OpenBSD 6.6
Details : OpenBSD 6.6 (GENERIC.MP) #372: Sat Oct 12 10:56:27 MDT
2019
[email protected]:/usr/src/sys/arch/amd64/compile/GENERIC.MP
Architecture: OpenBSD.amd64
Machine : amd64
>Description:
When proxying HTTP, if relayd receives invalid HTTP from a backend
server
it reports either "406 Not Acceptable" or "400 Bad Request", depending.
Both of theses codes imply that the /user/ did something wrong, but in
fact the server faulted so it should be a "500 Internal Server Error".
>How-To-Repeat:
```
$ cat > relayd.conf <<EOF
table <web> { "127.0.0.1" }
http protocol web {
# Return HTTP/HTML error pages to the client
return error
}
relay web {
listen on 0.0.0.0 port 80
protocol web
forward to <web> port 8080
}
EOF
$ doas relayd -f relayd.conf
```
i. No backend => 500 Internal Server Error (expected)
```
$ curl -f http://localhost/
curl: (22) The requested URL returned error: 500 Internal Server Error
```
ii. "" => 406 Not Acceptable (bug!)
```
$ echo | nc -v -l 8080 >/dev/null
Listening on 0.0.0.0 8080
Connection received on localhost 11230
```
```
$ curl -f http://localhost/
curl: (22) The requested URL returned error: 406 Not Acceptable
```
iii. invalid content => 400 Bad Request (bug!)
Here we pretend we accidentally proxied to an ssh server instead of
http:
```
$ echo "SSH-2.0-OpenSSH_6.2" | nc -v -l 8080 >/dev/null
Listening on 0.0.0.0 8080
Connection received on localhost 7965
```
```
$ curl -f http://localhost/
curl: (22) The requested URL returned error: 400 Bad Request
```
iv. valid http => 200 OK (expected)
```
$ nc -v -l 8080 > /dev/null <<EOF
HTTP/1.1 200 OK
Content-Length: 10
123456789
EOF
Listening on 0.0.0.0 8080
Connection received on localhost 18690
```
```
$ curl -f http://localhost/
123456789
```
