remove content length #3104

Job	Run time
clang-sanitizers (,thread)	30m 15s
linux-compat (manylinux1-x64)	29m 0s
clang-sanitizers (,address,undefined)	30m 13s
linux-compat (manylinux1-x86)	29m 2s
linux-compiler-compat (clang-3)	29m 19s
linux-shared-libs	29m 43s
linux-compat (manylinux2014-x64)	29m 16s
linux-compiler-compat (clang-6)	29m 20s
linux-compat (manylinux2014-x86)	29m 4s
linux-compiler-compat (clang-8)	29m 20s
linux-compat (al2-x64)	28m 44s
linux-compiler-compat (clang-9)	29m 23s
linux-compiler-compat (clang-10)	29m 24s
byo-crypto	2m 31s
linux-compiler-compat (clang-11)	29m 21s
linux-compiler-compat (gcc-4.8)	29m 3s
windows	30m 17s
linux-compiler-compat (gcc-5)	29m 19s
linux-compiler-compat (gcc-6)	29m 16s
windows-shared-libs	30m 11s
linux-compiler-compat (gcc-7)	29m 16s
windows-vc14 (x86)	29m 17s
linux-compiler-compat (gcc-8)	29m 18s
windows-vc14 (x64)	29m 23s
downstream	29m 57s
linux-debug	29m 16s
osx	30m 23s
windows-app-verifier	50m 52s
	13h 39m 43s

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