Rust cli program, that registers itself as default browser and opens URLs in different programs/browsers, based on:

• URL regexes
• MIME types in HEAD responses

Configured via openurl2.toml in the following locations (first one wins):

• whatever the dirs lib thinks configs go in. On linux, most likely XDG_CONFIG_HOME
• (macos only) ~/Library/Preferences
• ~/.config/

config

Rules are evaluated in order; the first match wins and no further rules are checked.

# Global MIME handlers. Used whenever a rule triggers MIME detection
[mime]
"application/pdf"          = "qpdfview"
"video/*"                  = "mpv"
"audio/*"                  = ["mpv", "--force-window=yes", "%u"]
"text/html"                = "firefox"
"*/*"                      = "firefox"  # catch-all for unrecognized MIME types

# Ordered rules. First match wins
[[rule]]
pattern = "https?://meet\\.google\\.com/.*"
run = "chromium"  # direct launch, no MIME fetch

[[rule]]
pattern = "https?://(www\\.)?youtube\\.com/.*"
run = "mpv"

[[rule]]
pattern = "https?://internal\\.corp/docs/.*"
fetch_mime = true
# override a global MIME handler for this rule only
[rule.mime]
"application/pdf" = "evince"

[[rule]]
# no pattern = matches everything; use as fallback
fetch_mime = true

rules

Field	Description
pattern	Regex matched against the URL. Omit to match everything (useful as a fallback).
run	Program to launch. String (URL appended as last arg) or array (use %u as URL placeholder).
fetch_mime	If true, perform a HEAD request and dispatch via MIME type.
[rule.mime]	Per-rule MIME overrides. Checked before the global [mime] table.

mime

When fetch_mime = true, the MIME type from the HEAD response is looked up in [rule.mime] first, then in the global [mime] table. Glob patterns (video/*) are supported. If no entry matches, the rule is skipped and matching continues.

Note: Avoid using xdg-open (or similar default-browser launchers) as a handler, if you've registered openurl2 as your default browser, to prevent infinite loops