net/http: fix typo in TestTransportReadToEndReusesConn
The test sets a Content-Type where it looks like it wants a Content-Length. The test passes because the Content-Length header is automatically added anyway, but fix the typo and set Content-Length as intended.
Change-Id: Ic2af778f82c3e9d58e164892f6ac6ef5745f884f
Reviewed-on: https://go-review.googlesource.com/c/go/+/246977
Reviewed-by: Damien Neil <dneil@google.com>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Trust: Damien Neil <dneil@google.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>