Merge pull request #121 from mlocati/extra_headers-v2 #183

Job	Run time
test-dependencies (phpxmlrpc/extras)	1m 26s
test-dependencies (phpxmlrpc/polyfill-xmlrpc)	1m 4s
test (8.4, ubuntu-24.04)	1m 53s
test (8.3, ubuntu-22.04)	4m 48s
test (8.2, ubuntu-22.04)	4m 43s
test (8.1, ubuntu-22.04)	4m 51s
test (8.0, ubuntu-22.04)	4m 42s
test (7.4, ubuntu-22.04, true)	5m 43s
test (7.3, ubuntu-22.04)	4m 30s
test (7.2, ubuntu-20.04)	6m 31s
test (7.1, ubuntu-20.04)	6m 52s
test (7.0, ubuntu-20.04)	6m 45s
test (5.6, ubuntu-20.04)	6m 59s
test (5.5, ubuntu-22.04)	4m 10s
test (5.4, ubuntu-20.04)	6m 27s
	1h 11m 24s

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