Fix issue with direct_functions and path behaviour

- The path clipping / transforming behaviour must be turned-off
when we are not using direct_functions as is used in
faas-nomad and faas-ecs. This will need a change in each provider
to strip paths, but fixes a 404 error these users will see if they
upgrade to 0.9.2 or newer. 0.9.3 will have a this fix meaning
the whole un-edited path is passed to the provider when
direct_functions is set to false.

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>

gateway/handlers/forwarding_proxy.go

@@ -9,6 +9,7 @@ import (
 	"io"
 	"log"
 	"net/http"
+	"os"
 	"regexp"
 	"strconv"
 	"strings"
@@ -100,6 +101,10 @@ func forwardRequest(w http.ResponseWriter, r *http.Request, proxyClient *http.Cl
 		defer upstreamReq.Body.Close()
 	}
 
+	if _, exists := os.LookupEnv("write_request_uri"); exists {
+		log.Printf("forwardRequest: %s %s\n", upstreamReq.Host, upstreamReq.URL.String())
+	}
+
 	ctx, cancel := context.WithTimeout(context.Background(), timeout)
 	defer cancel()