Revert "Override Content-Length and Transfer-Encoding in http-over-capnp."
Revert "Override Content-Length and Transfer-Encoding in http-over-capnp."

This reverts commit 0123e17116e1a3f0520300cb3670b01a2cd2a1e5.

This wasn't the right place to solve this problem. The same problem applies when calling an HttpService directly, or using an HttpClient that wraps an in-process HttpService. Applications that struggle with this need to find a better solution.

mologie/capnproto,mologie/capnproto,mologie/capnproto