Don't prefix Url.Path with a slash in Request.write, because Url.Path already starts with one. Avoid crashing in Request.ParseForm if there is no body.
Don't prefix Url.Path with a slash in Request.write,
because Url.Path already starts with one.
Avoid crashing in Request.ParseForm if there is no body.

R=rsc
APPROVED=rsc
DELTA=5  (4 added, 0 deleted, 1 changed)
OCL=30552
CL=30607

wesolows/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,wesolows/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,wesolows/golang-old,wesolows/golang,wesolows/golang,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang-old,firebitsbr/golang-old