Question 1

Is http-parser still maintained?

Accepted Answer

No, the README clearly states it is not actively maintained and recommends using llhttp for new projects. This means no further development or security patches.

Question 2

http-parser vs llhttp: which should I use?

Accepted Answer

llhttp is the actively maintained successor with better support for modern features. For new projects, llhttp is recommended; http-parser is only suitable for legacy systems where migration isn't feasible.

Question 3

How to handle WebSocket upgrades with http-parser?

Accepted Answer

http-parser correctly parses upgrade headers and sets parser->upgrade to 1 after http_parser_execute(). Non-HTTP data begins at the buffer offset by the return value, as explained in the 'Special Problem of Upgrade' section.

Question 4

Can http-parser be used in multi-threaded applications?

Accepted Answer

Yes, by using the parser's data field to pass thread-local information, as demonstrated in the callback example. This allows safe communication between threads and callbacks.

Question 5

Does http-parser support HTTP/2?

Accepted Answer

No, http-parser is designed only for HTTP/1.x messages. It does not parse HTTP/2 or HTTP/3 frames, which limits its usability in modern web servers.

Question 6

How to parse URLs with http-parser?

Accepted Answer

Use the provided http_parser_parse_url() function for zero-copy URL parsing. This is useful after accumulating URL data from consecutive on_url callbacks, as mentioned in the 'Parsing URLs' section.

Question 7

What are the performance benchmarks for http-parser?

Accepted Answer

It's optimized for speed with zero-copy parsing and minimal memory usage, but specific benchmarks aren't provided in the README. Real-world performance depends on implementation and hardware.

http-parser

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