Prevent DOS due large SAML Message #612

Job	Run time
rubocop	32s
Unit test (ubuntu-20.04, 3)	1s
Unit test (ubuntu-20.04, 3.3)	1d 0h 0m 1s
Unit test (ubuntu-20.04, 3.1)	1s
Unit test (ubuntu-20.04, jruby-9.4)	1s
Unit test (ubuntu-20.04, 3.4)	1s
Unit test (ubuntu-20.04, 3.2)	1d 0h 0m 1s
Unit test (macos-latest, 3)	1m 46s
Unit test (macos-latest, 3.1)	2m 11s
Unit test (macos-latest, 3.4)	2m 10s
Unit test (macos-latest, jruby-9.4)	2m 33s
Unit test (macos-latest, 3.2)	2m 20s
Unit test (macos-latest, truffleruby)	2m 44s
Unit test (windows-latest, 3.2)	3m 8s
Unit test (windows-latest, 3.1)	2m 59s
Unit test (windows-latest, 3)	3m 14s
Unit test (windows-latest, 3.3)	3m 42s
Unit test (macos-latest, 3.3)	1m 54s
Unit test (windows-latest, 3.4)	3m 14s
Unit test (ubuntu-20.04, truffleruby)	1s
finish	0s
	2d 0h 32m 34s

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