REGTESTS: lua: test httpclient with body streaming

Improve the httpclient reg-tests to test the streaming,

The regtest now sends a big payload to vtest, then receive a payload
from vtest and send it again.

reg-tests/lua/lua_httpclient.lua

@@ -1,8 +1,10 @@
 
 local vtc_port = 0
+local vtc_port2 = 0
 
 core.register_service("fakeserv", "http", function(applet)
 	vtc_port = applet.headers["vtcport"][0]
+	vtc_port2 = applet.headers["vtcport2"][0]
 	core.Info("APPLET START")
 	local response = "OK"
 	applet:add_header("Server", "haproxy/webstats")
@@ -22,14 +24,20 @@ local function cron()
 
 	local body = ""
 
-	for i = 0, 200 do
+	for i = 0, 2000 do
 	   body = body .. i .. ' ABCDEFGHIJKLMNOPQRSTUVWXYZ\n'
         end
-
+	core.Info("First httpclient request")
 	local httpclient = core.httpclient()
 	local response = httpclient:post{url="http://127.0.0.1:" .. vtc_port, body=body}
-
 	core.Info("Received: " .. response.body)
+
+	body = response.body
+
+	core.Info("Second httpclient request")
+	local httpclient2 = core.httpclient()
+	local response2 = httpclient2:post{url="http://127.0.0.1:" .. vtc_port2, body=body}
+
 end
 
 core.register_task(cron)

reg-tests/lua/lua_httpclient.vtc

@@ -1,4 +1,12 @@
 varnishtest "Lua: check httpclient functionality from a lua-task"
+
+# A request if first made with c0 with the port of s1 and s2 so the httpclient
+# can generate its URI with it.
+#
+# This reg-test sends a payload with the httpclient to s1, s1 returns another
+# payload. The 2nd lua httpclient sends back the payload from s1 to s2.
+#
+
 feature cmd "$HAPROXY_PROGRAM -cc 'version_atleast(2.5-dev7)'"
 feature ignore_unknown_macro
 
@@ -6,7 +14,14 @@ feature ignore_unknown_macro
 
 server s1 {
     rxreq
-    txresp -bodylen 20
+    txresp -bodylen 200
+    expect req.body ~ ".*2000 ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+} -start
+
+server s2 {
+   rxreq
+   txresp
+   expect req.bodylen == 200
 } -start
 
 haproxy h1 -conf {
@@ -25,10 +40,11 @@ haproxy h1 -conf {
 } -start
 
 client c0 -connect ${h1_fe1_sock} {
-    txreq -url "/" -hdr "vtcport: ${s1_port}"
+    txreq -url "/" -hdr "vtcport: ${s1_port}" -hdr "vtcport2: ${s2_port}"
     rxresp
     expect resp.status == 200
 } -run
 
 
 server s1 -wait
+server s2 -wait