API Testing · Junior · Question 68 of 75

Are HTTP header names case-sensitive?

1No, Content-Type and content-type are the same header
2Yes, a header with the wrong case is always ignored
3Only custom headers are case-insensitive

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Correct answer: No, Content-Type and content-type are the same header

Explanation

HTTP/2 even sends them in lowercase. Tests that compare header names exactly as strings may fail for no real reason.

Further reading

RFC 9110: HTTP Semantics ↗

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