Test

middleware: fix typo in RealIP doc (#903) #373

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Run time

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Job	Run time
test (1.15.x, ubuntu-latest)	1m 45s
test (1.15.x, windows-latest)	2m 32s
test (1.16.x, ubuntu-latest)	1m 42s
test (1.16.x, windows-latest)	1m 29s
test (1.17.x, ubuntu-latest)	1m 34s
test (1.17.x, windows-latest)	1m 35s
test (1.18.x, ubuntu-latest)	1m 33s
test (1.18.x, windows-latest)	1m 31s
test (1.19.x, ubuntu-latest)	51s
test (1.19.x, windows-latest)	1m 36s
test (1.20.x, ubuntu-latest)	52s
test (1.20.x, windows-latest)	2m 0s
test (1.21.x, ubuntu-latest)	55s
test (1.21.x, windows-latest)	2m 22s
test (1.22.x, ubuntu-latest)	58s
test (1.22.x, windows-latest)	2m 12s
	25m 27s