Support absolute uri in `request_json` #412

Job	Run time
Documentation	3m 7s
Julia 1.4 / generate=false / ubuntu-latest / x64 / pull_request	8m 40s
Julia 1.4 / generate=false / windows-latest / x64 / pull_request	19m 30s
Julia 1 / generate=false / ubuntu-latest / x64 / pull_request	4m 56s
Julia 1 / generate=false / windows-latest / x64 / pull_request	6m 54s
Julia nightly / generate=false / ubuntu-latest / x64 / pull_request	9m 0s
Julia nightly / generate=false / windows-latest / x64 / pull_request	10m 26s
Julia 1.4 / generate=true / ubuntu-latest / x64 / pull_request	9m 55s
Julia 1.4 / generate=true / windows-latest / x64 / pull_request	21m 57s
Julia 1 / generate=true / ubuntu-latest / x64 / pull_request	5m 35s
Julia 1 / generate=true / windows-latest / x64 / pull_request	7m 30s
Julia nightly / generate=true / ubuntu-latest / x64 / pull_request	9m 34s
Julia nightly / generate=true / windows-latest / x64 / pull_request	12m 14s
	2h 9m 18s

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