Fix JSON serialization relying on response content
Fix JSON serialization relying on response content

Signed-off-by: Javier Revillas <61b34c323f9ed27e02de2ce32e45b5d66a0a0068@massivedynamic.io>

rgee0/faas,openfaas/faas,rgee0/faas,alexellis/faas,alexellis/faas,alexellis/faas,alexellis/faas,rgee0/faas,alexellis/faas,rgee0/faas,rgee0/faas,alexellis/faas,rgee0/faas,rgee0/faas,rgee0/faas,rgee0/faas,alexellis/faas,openfaas/faas,openfaas/faas,alexellis/faas,alexellis/faas,rgee0/faas