Add example for `request` + "Garbage Collection" (#3916) #4

Job	Run time
benchmark current	4m 48s
benchmark branch	5m 13s
benchmark (sending data) current	4m 27s
benchmark branch h2	2m 55s
benchmark current h2	6h 0m 15s
benchmark (sending data) branch	4m 33s
	6h 22m 11s

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