hyperium/h2

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HTTP 2.0 client & server implementation for Rust.

Stars: 1.6k
Forks: 382
Open beginner issues: 0
Indexed issues: 62
Avg merge: 20h 23m
Merged PRs (30d): 9

Dominant language: Rust
License: MIT
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

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62 open issues indexed

Proposal: add support for Extension frames Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

hyperium/h2#952 · 2 comments · Opened Sep 2, 2026
Proposal: enable an HTTP/2 header-block read timeout Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

hyperium/h2#928 · 1 comment · 1 reaction · Opened Aug 3, 2026
Sending and receiving data frames introduces significant overhead Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

hyperium/h2#902 · 1 comment · Opened May 5, 2026
load_hpack takes ~9% of total CPU at high request rates Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

hyperium/h2#883 · 3 comments · Opened Mar 30, 2026
RecvStream::is_end_stream() is never true. RecvStream::data() never returns None Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

hyperium/h2#882 · 1 comment · Opened Mar 28, 2026
Implicit RST_STREAM blocked until buffered DATA is fully drained Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

hyperium/h2#880 · 1 comment · Opened Mar 25, 2026
Streaming latency spikes: receive loop processes all buffered frames before yielding Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#879 · 2 comments · Opened Mar 5, 2026
try_assign_capacity triggers debug assertion Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

hyperium/h2#878 · 2 comments · Opened Feb 25, 2026
Outbound HTTP/2 frames can emit conflicting :authority and host headers Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

hyperium/h2#876 · 2 reactions · Opened Feb 12, 2026
`h2::Error` hides IO error Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

hyperium/h2#862 · 2 comments · Opened Sep 4, 2025
Increasing window_size above initial_window_size Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

hyperium/h2#857 · Opened Aug 6, 2025
Logical connection deadlock occurs under high concurrency - outgoing data transmission stops Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

hyperium/h2#853 · Opened Jul 22, 2025
`SendStream::ready()` behaviour does match documentation (always return immediately as Ready) Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#848 · 1 comment · 1 reaction · Opened Jun 26, 2025
Server sends GoAway to closed connection (resulting in errors on macos/bsd) Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

hyperium/h2#843 · Opened Apr 18, 2025
Extend hpack mod visibility in 'unstable' feature set Open

Difficulty 2/5 1-3 hours Newbie friendliness 25/100

hyperium/h2#828 · 3 comments · 2 reactions · Opened Jan 2, 2025
Add options to set h2 keepalive_timeout? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#826 · 8 comments · Opened Dec 24, 2024
Is there a way to configure h2 client_header_timeout? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

hyperium/h2#823 · 2 comments · Opened Dec 5, 2024
Push_promise seems to be stuck Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#811 · 3 comments · Opened Nov 6, 2024
Akamai example is broken on negotiated ALPN Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

hyperium/h2#808 · Opened Nov 4, 2024
Tolerate send_open() at Closed state? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#803 · 2 comments · Opened Oct 14, 2024
unexpected window size impact on tls conncetions with h2 large uploads Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

hyperium/h2#797 · 3 comments · Opened Aug 28, 2024
Allow disabling header compression Open

Difficulty 5/5 Over a week Newbie friendliness 38/100

hyperium/h2#780 · 4 comments · Opened May 18, 2024
Allow max_concurrent_reset_streams>0 on browser environments Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#779 · Opened May 12, 2024
Default server configuration prevents the use of server pushes Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

hyperium/h2#755 · 3 comments · Opened Mar 1, 2024
Respond with an HTTP 4xx rather than only a `RST_STREAM` to malformed requests Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

hyperium/h2#747 · 2 comments · 1 reaction · Opened Feb 16, 2024
Documentation: How to handle GOAWAY Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#741 · 2 comments · Opened Jan 17, 2024
custom SETTINGS settings Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

hyperium/h2#729 · Opened Dec 15, 2023
Remove tokio I/O traits from dependencies Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#720 · 6 comments · 5 reactions · Opened Oct 28, 2023
Make tracing an optional feature Open

Difficulty 3/5 1-2 days Newbie friendliness 54/100

hyperium/h2#713 · 5 comments · 3 reactions · Opened Sep 11, 2023
Panic due to the max headers capacity Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

hyperium/h2#700 · 1 comment · Opened Jul 18, 2023
Handling of RFC7540 8.1.2.5 Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

hyperium/h2#699 · 5 comments · Opened Jul 6, 2023
Consider moving hyper's h2 support types to h2 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

hyperium/h2#656 · 1 comment · 5 reactions · Opened Jan 2, 2023
Receiving `FRAME_SIZE_ERROR` in complex setup Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#644 · 1 comment · Opened Oct 26, 2022
Client receives `unexpected end of file` randomly Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

hyperium/h2#636 · 6 comments · 4 reactions · Opened Aug 19, 2022
Add option to send ORIGIN frame Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#632 · 3 comments · Opened Aug 8, 2022
Mem leak when releasing stream Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#631 · 3 comments · 3 reactions · Opened Aug 1, 2022
Hyper test would fail if an existing bug in tokio-util's `LengthDelimitedCodec` is fixed Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

hyperium/h2#624 · 1 reaction · Opened Jul 9, 2022
Allow configurable restrictiveness for various header checks Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

hyperium/h2#619 · Opened May 31, 2022
Bad feedback on reset stream Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

hyperium/h2#592 · 3 comments · Opened Jan 3, 2022
Out of bounds access in h2::hpack::table::Table::index_dynamic Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

hyperium/h2#590 · Opened Dec 15, 2021
manany request is pending Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

hyperium/h2#573 · 8 comments · Opened Nov 1, 2021
Move codec to a separate crate Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

hyperium/h2#568 · 4 comments · 1 reaction · Opened Oct 20, 2021
Don't discard pending data frames on errors Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

hyperium/h2#536 · 9 comments · Opened May 3, 2021
Library does not scale with multiple cores Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

hyperium/h2#531 · 23 comments · 4 reactions · Opened Apr 21, 2021
expose information about negotiated connection settings Open

enhancement

hyperium/h2#512 · 5 comments · 1 assignee · Opened Feb 3, 2021
reducing binary bloat rooted in hyper & h2 Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

hyperium/h2#483 · 7 comments · 2 reactions · Opened Sep 8, 2020
Sending large body chunks (2GB+) are wrongly rejected Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

hyperium/h2#471 · 1 comment · Opened Jun 5, 2020
Improve Error when handshake determines peer isn't using HTTP2 Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

hyperium/h2#470 · 2 reactions · Opened Jun 4, 2020
A way to determine the type of Error Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

hyperium/h2#463 · 1 comment · 1 reaction · Opened May 5, 2020
Zero-copy transmission with splice/sendfile Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hyperium/h2#381 · 1 comment · Opened Jun 28, 2019

hyperium/h2

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