Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)?
   Go 1.5.2
2. What operating system and processor architecture are you using (go env)?
   windows_amd64
3. What did you do?
   If possible, provide a recipe for reproducing the error.
   A complete runnable program is good.
   A link on play.golang.org is best.

https://play.golang.org/p/DaWZXCQNfV
this example ends up with error "http: invalid Read on closed Body"

https://play.golang.org/p/WYCsIQzx_F
but changing 100 to 10 in strings.Repeat goes without any errors

also this example https://play.golang.org/p/YxjKnmgfGP
$ curl -d 'qweqweq weq weqwe qwe qew qwe' http://localhost:6060/
<qweqweq weq weq><we qwe qew qwe >

shows that reading and writing goes simultaneously and without errors

1. What did you expect to see?
   i expect to see the same error in both cases
2. What did you see instead?
   i see different behaviour