REGTESTS: http: add a test to validate chunked responses delivery

I've had this test here never committed over the last 2.5 years, that
works fine and I didn't notice it was not part of the tree. It makes a
server return odd-sized chunked responses with short pauses between half
of thems and verifies they're not truncated on the client. It may detect
eventually state machine breakages, so better commit it.

diff --git a/reg-tests/http-messaging/truncated.vtc b/reg-tests/http-messaging/truncated.vtc
new file mode 100644 (file)
index 0000000..b731320
--- /dev/null
+++ b/reg-tests/http-messaging/truncated.vtc
@@ -0,0 +1,101 @@
+varnishtest "HTTP response size tests: H2->H1 (HTX and legacy mode)"
+#REQUIRE_VERSION=1.9
+
+feature ignore_unknown_macro
+
+server s1 {
+       rxreq
+       txresp \
+         -status 200 \
+         -nolen \
+         -hdr "Transfer-encoding: chunked"
+       #  -bodylen 16300
+       #chunkedlen 16300
+       #delay 0.05
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+       chunkedlen 815
+       #delay 0.05
+       chunkedlen 815
+       delay 0.05
+} -repeat 2 -start
+
+haproxy h1 -conf {
+    defaults
+       #log stdout format raw daemon
+       mode http
+       option http-buffer-request
+       timeout connect 1s
+       timeout client  1s
+       timeout server  1s
+
+    listen feh1
+       bind "fd@${feh1}"
+       bind "fd@${feh2}" proto h2
+       http-response add-header a b
+       #http-response del-header content-length
+       server s1 ${s1_addr}:${s1_port}
+} -start
+
+client c1h2 -connect ${h1_feh2_sock} {
+       txpri
+       stream 0 {
+               txsettings
+               rxsettings
+               txsettings -ack
+               rxsettings
+               expect settings.ack == true
+       } -run
+
+       # first request is valid
+       stream 1 {
+               txreq \
+                 -req "GET" \
+                 -scheme "https" \
+                 -url "/test1.html"
+               rxhdrs
+               #delay 0.1
+               expect resp.status == 200
+               rxdata -all
+               expect resp.bodylen == 16300
+               #expext resp.chunkedlen == 16300
+       } -run
+} -repeat 2 -run