Revert "fix(client): send content-length even with no body" #3633
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This reverts commit 172fdfa.
The curl test suite noticed this change, and it was unexpected. curl/curl#13380
On further review, RFC 9112 Section 6.3 states:
So, hyper does not need to do this. Any server that fails to understand there is no body is in direct violation of the spec.