Similar to the network tab in Google Chrome or Mozilla Firefox, this crate helps you find the timings for:
- DNS lookup (if domain is specified, i.e. no IP is given)
- TCP connection start
- TLS handshake (if https/TLS is used)
- Initial GET-Request
- TTFB (Time To First Byte)
It builds upon the crates trust-dns-resolver for modern and secure DNS resolving of domains and native-tls for handling TLS v1.2/1.3.
CLI + lib work on Linux, MacOS, and Windows.
Install with cargo install ttfb
. It takes one argument and passes it to the library.
The string you pass here as first argument is the same as for the library function.
Additionally, the CLI takes a -k/--insecure
option.
Example: $ ttfb -k https://expired.badssl.com
The library exposes the function ttfb(url: String)
. The string can be for example:
phip1611.de
(defaults tohttp://
)http://phip1611.de
https://phip1611.de
https://phip1611.de?foo=bar
https://sub.domain.phip1611.de?foo=bar
http://12.34.56.78/foobar
https://1.1.1.1
12.34.56.78/foobar
(defaults tohttp://
)12.34.56.78
(defaults tohttp://
)
If you installed the CLI and invoke it like $ ttfb https://phip1611.de
, the output will look like:
TTFB for https://phip1611.de (by [email protected])
PROPERTY REL TIME (ms) ABS TIME (ms)
DNS Lookup : 0.755 0.755 (probably cached)
TCP connect : 35.484 36.239
TLS Handshake : 36.363 72.603
HTTP GET Req : 0.011 72.614
HTTP Resp TTFB: 76.432 149.046
This crate uses the Rust edition 2021. This means, the MSRV is 1.56.1 stable.