Disable caching of connections from router to function pods (#742)

A temporary fix for #723 which needs to be optimized in future. Disables caching of connections from the router to function pod/service.

router/functionHandler.go

@@ -94,6 +94,8 @@ func (roundTripper RetryingRoundTripper) RoundTrip(req *http.Request) (resp *htt
 	// set the timeout for transport context
 	timeout := roundTripper.initialTimeout
 	transport := http.DefaultTransport.(*http.Transport)
+	// Disables caching, Please refer to issue and specifically comment: https://github.com/fission/fission/issues/723#issuecomment-398781995
+	transport.DisableKeepAlives = true
 
 	// cache lookup to get serviceUrl
 	serviceUrl, err = roundTripper.funcHandler.fmap.lookup(roundTripper.funcHandler.function)

test/tests/test_fn_update/test_configmap_update.sh

@@ -1,6 +1,4 @@
 #!/bin/bash
-# Disabling for https://github.com/fission/fission/issues/723 will enable after resolution/cluster upgrade
-#test:disabled
 
 set -euo pipefail
 

test/tests/test_fn_update/test_nd_pkg_update.sh

@@ -1,6 +1,4 @@
 #!/bin/bash
-# Disabling for https://github.com/fission/fission/issues/723 will enable after resolution/cluster upgrade
-#test:disabled
 
 set -euo pipefail
 

test/tests/test_fn_update/test_secret_update.sh

@@ -1,6 +1,4 @@
 #!/bin/bash
-# Disabling for https://github.com/fission/fission/issues/723 will enable after resolution/cluster upgrade
-#test:disabled
 
 set -euo pipefail