Reproducer for bug in Kubernetes proxy
======================================
kubectl proxy doesn't forward Content-Length header to services:
# curl -v -X POST --data-binary @contentlength-bug-pod.yaml http://localhost:8080/api/v1/proxy/namespaces/default/services/contentlength/
* Trying ::1...
* connect to ::1 port 8080 failed: Connection refused
* Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 8080 (#0)
> POST /api/v1/proxy/namespaces/default/services/contentlength/ HTTP/1.1
> User-Agent: curl/7.40.0
> Host: localhost:8080
> Accept: */*
> Content-Length: 245
> Content-Type: application/x-www-form-urlencoded
>
* upload completely sent off: 245 out of 245 bytes
< HTTP/1.1 418 I'm a teapot
< Date: Thu, 22 Oct 2015 11:16:37 GMT
< Content-Length: 0
< Content-Type: text/plain; charset=utf-8
<
* Connection #0 to host localhost left intact
# kubectl logs contentlength
('172.16.36.0', 48397)
POST / HTTP/1.1
Host: 172.16.20.20:8080
User-Agent: curl/7.40.0
Transfer-Encoding: chunked
Accept: */*
Content-Type: application/x-www-form-urlencoded
X-Forwarded-Host:
X-Forwarded-Proto:
X-Forwarded-Uri: /api/v1/proxy/namespaces/default/services/contentlength/
Accept-Encoding: gzip
1
a
f4
piVersion: v1
kind: Pod
metadata:
name: contentlength
labels:
name: contentlength
spec:
containers:
- image: tiran/k8s-contentlength:latest
name: contentlength
ports:
- containerPort: 8080
name: contentlength
0
---
# tcpdump -A -s 0 -i lo tcp port 8080
13:18:48.562025 IP localhost.50826 > localhost.webcache: Flags [P.], seq 1:450, ack 1, win 342, options [nop,nop,TS val 2483619460 ecr 2483619457], length 449: HTTP: POST /api/v1/proxy/namespaces/default/services/contentlength/ HTTP/1.1
E.....@.@..`............eA. .Oh....V.......
. ... ..POST /api/v1/proxy/namespaces/default/services/contentlength/ HTTP/1.1
User-Agent: curl/7.40.0
Host: localhost:8080
Accept: */*
Content-Length: 245
Content-Type: application/x-www-form-urlencoded
apiVersion: v1
kind: Pod
metadata:
name: contentlength
labels:
name: contentlength
spec:
containers:
- image: tiran/k8s-contentlength:latest
name: contentlength
ports:
- containerPort: 8080
name: contentlength
13:18:48.562062 IP localhost.webcache > localhost.50826: Flags [.], ack 450, win 350, options [nop,nop,TS val 2483619460 ecr 2483619460], length 0
E..4n.@.@................Oh.eA.....^.(.....
. ... ..
13:18:48.568962 IP localhost.webcache > localhost.50826: Flags [P.], seq 1:127, ack 450, win 350, options [nop,nop,TS val 2483619467 ecr 2483619460], length 126: HTTP: HTTP/1.1 418 I'm a teapot
E...n.@.@..?.............Oh.eA.....^.......
. ... ..HTTP/1.1 418 I'm a teapot
Date: Thu, 22 Oct 2015 11:18:48 GMT
Content-Length: 0
Content-Type: text/plain; charset=utf-8