more explicit url errors #942

Job	Run time
Build (x86_64-pc-windows-msvc)	6m 43s
Build (aarch64-pc-windows-msvc)	6m 24s
Build (x86_64-apple-darwin)	8m 7s
Build (aarch64-apple-darwin)	9m 21s
Build (aarch64-apple-ios)	8m 24s
Build (aarch64-apple-ios-sim)	8m 19s
Build (x86_64-unknown-linux-gnu)	3m 22s
Build (aarch64-unknown-linux-gnu)	15m 8s
Build (aarch64-linux-android)	3m 50s
Build (armv7-linux-androideabi)	3m 32s
Build (x86_64-linux-android)	3m 43s
	1h 16m 53s

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