test: do not send Content-Length header for HEAD requests (#1771) #2644

Job	Run time
Java_21 (chromium)	4m 40s
stable (ubuntu-latest, chrome)	5m 32s
Java_21 (firefox)	9m 46s
dev (ubuntu-latest, chromium)	4m 34s
stable (windows-latest, chrome)	10m 54s
Java_21 (webkit)	7m 13s
dev (ubuntu-latest, firefox)	9m 35s
stable (macos-latest, chrome)	12m 1s
dev (ubuntu-latest, webkit)	30m 14s
stable (windows-latest, msedge)	23m 20s
dev (windows-latest, chromium)	7m 59s
stable (macos-latest, msedge)	23m 39s
dev (windows-latest, firefox)	13m 29s
dev (windows-latest, webkit)	9m 0s
dev (macos-latest, chromium)	9m 45s
dev (macos-latest, firefox)	9m 53s
dev (macos-latest, webkit)	30m 16s
	3h 41m 50s

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