Measure time to first byte

Benchmark TTFB and total request time

curl -o /dev/null -sS -w 'ttfb: %{time_starttransfer}s\ntotal: %{time_total}s\n' https://example.com
tool
curl21 commands
tags
curlmonitoring

More curl commands

  • Show response headers only
    curl -sI https://example.com

    Print HTTP response headers without body

  • Upload file multipart
    curl -F 'file=@./report.pdf' -F 'user=alice' https://upload.example.com/api

    Multipart form-data upload with extra fields

  • HTTP/2 request
    curl --http2 -sI https://example.com | grep -i 'http\|alt-svc'

    Force HTTP/2 and check protocol in response

  • Set custom DNS resolver
    curl --resolve example.com:443:1.2.3.4 https://example.com

    Override DNS for a host:port pair (test behind CDN/LB)

  • Retry on failure
    curl --retry 5 --retry-delay 2 --retry-all-errors https://api.example.com/healthz

    Retry up to 5 times with 2s delay on any error

all 21 curl commands