oha – HttpArena

oha

oha is an HTTP load generator with HTTP/3 (QUIC) support, used for the baseline-h3 and static-h3 test profiles.

Usage in HttpArena

oha handles all HTTP/3 benchmarks, sending requests over QUIC to port 8443:

oha https://localhost:8443/baseline2?a=1&b=1 \
    --http-version 3 --insecure \
    -c 64 -p 128 -z 5s \
    -o results.json --output-format json

For multi-URI static file tests:

oha requests/static-h2-uris.txt \
    --urls-from-file \
    --http-version 3 --insecure \
    -c 64 -p 128 -z 5s \
    -o results.json --output-format json

Parameters

Parameter	Description
`--http-version 3`	Force HTTP/3 (QUIC)
`--insecure`	Accept self-signed TLS certificates
`-c`	Number of connections
`-p`	Parallelism (concurrent requests per connection)
`-z`	Test duration
`-o` / `--output-format json`	JSON output to file

Known issues

oha’s --no-tui flag causes severe performance degradation with HTTP/3. As a workaround, HttpArena runs oha with the TUI active and captures results via -o file --output-format json. This means oha must have direct TTY access and cannot run in a subshell or background process.

Due to this limitation, HTTP/3 results may show higher variance than HTTP/1.1 and HTTP/2 benchmarks. A disclaimer is shown on the HTTP/3 leaderboard.