IssueTracker

When doing a call to an App Engine Flex service that matches a dispatch rule for that service, and the service is specified on the host, traffic splitting does not work.

Reproduction steps:

1.- Clone the example (this service returns the version ID to GET requests):

$ git clone https://gist.github.com/5db688a3065ad3afc6687872c08a4282.git
$ cd 5db688a3065ad3afc6687872c08a4282

2.- Deploy 2 versions of the service:

$ gcloud app deploy -v v1 -q
$ gcloud app deploy -v v2 --no-promote -q

3.- Deploy the dispatch rules:

$ gcloud app deploy dispatch.yaml -q

4.- Set the traffic splitting:

$ gcloud app services set-traffic dispatch --splits v1=.5,v2=.5 --split-by random -q

5.- Verify that the traffic splitting works when using only a dispatch rule OR the service on the host:

$ for i in {1..100}; do curl http://dispatch.$(gcloud config get-value project).appspot.com; done 2>/dev/null| sort | uniq -c
$ for i in {1..100}; do curl http://$(gcloud config get-value project).appspot.com/dispatch; done 2>/dev/null| sort | uniq -c

6.- Verify that the traffic splitting is not applied when using both a dispatch rule AND the service on the host:

$ for i in {1..100}; do curl http://dispatch.$(gcloud config get-value project).appspot.com/dispatch; done 2>/dev/null| sort | uniq -c