Discussion: Preserving Empty HTTP Header Values vs. Dropping Them

[walterlv]

This PR changes the behavior of header parsing in HttpBase:

• Before: headers with empty values (e.g. X-Test:) are dropped
• After: headers with empty values are preserved as empty strings

Discussion

Product/Library	Not sent	Sent but empty
ASP.NET Core	null	""
Node.js	undefined	''
Go (net/http)	""	""
Nginx	-	Drops when forwarding upstream
Envoy	-	Preserves at the protocol level
HAProxy	-	Generally preserves, but configurable

Benefits:

• Preserving empty headers makes them distinguishable from missing headers

Drawbacks:

• If a server checks for the presence of a header without considering empty values, it may lead to unexpected behavior (e.g. treating X-Test: as valid when it should be considered missing)

---

So, a decision needs to be made here.

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[RRQM]

非常感谢您的贡献！