# TLS Client Hello Mirror

=> /json/v1  Your browser's TLS Client Hello, reflected as JSON

This test:

* reflects the complete Client Hello message, preserving the order in which TLS parameters and extensions are sent;
* can be used to check for TLS privacy pitfalls (session resumption, TLS fingerprinting, system time exposure);
* supports multiple protocols (currently HTTP and Gemini);
* is free as in freedom and trivial to self-host.

JSON only, for now. The API is largely stable - fields may be added, but existing fields will not be modified or removed. IANA-assigned codes for TLS parameters and extensions are available at:

=> https://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml  TLS parameters
=> https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml  TLS extensions

Note that these lists do not include draft extensions and GREASE values. Missing values will be documented here as the project evolves.

_____________________
=> https://nervuri.net/  Author: nervuri
=> https://tildegit.org/nervuri/client-hello-mirror  Source (contributions welcome)
=> https://www.gnu.org/licenses/agpl-3.0.en.html  License: AGPL-3.0-or-later