net/http: update test to check Content-Length 0 Body more reliably

The way to send an explicitly-zero Content-Length is to set a nil Body.

Fix this test to do that, rather than relying on type sniffing.

Updates #17480
Updates #17071

Change-Id: I6a38e20f17013c88ec4ea69d73c507e4ed886947
Reviewed-on: https://go-review.googlesource.com/31434
TryBot-Result: Gobot Gobot <gobot@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>

diff --git a/src/net/http/clientserver_test.go b/src/net/http/clientserver_test.go
index 53e0be680bb89ceaccb3149b34daeef9d7385a64..f55242418976ec2950c93325aa37853bb3514e75 100644 (file)
--- a/src/net/http/clientserver_test.go
+++ b/src/net/http/clientserver_test.go
@@ -468,7 +468,7 @@ func TestH12_RequestContentLength_Known_NonZero(t *testing.T) {
 }
 
 func TestH12_RequestContentLength_Known_Zero(t *testing.T) {
-       h12requestContentLength(t, func() io.Reader { return strings.NewReader("") }, 0)
+       h12requestContentLength(t, func() io.Reader { return nil }, 0)
 }
 
 func TestH12_RequestContentLength_Unknown(t *testing.T) {