Add huge response body test (#1437)

test/tests/test_huge_response/hello.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"io/ioutil"
+	"net/http"
+)
+
+// Handler is the entry point for this fission function
+func Handler(w http.ResponseWriter, r *http.Request) {
+	bytes, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Write(bytes)
+}