[wleeaf]

DefaultContext.getHost() and getPort() split the host-and-port value at its first :. With an IPv6 address in the Host header (a browser sends Host: [::1]:8080 for http://[::1]:8080/), that gives:

Host	getHost()	getPort()	getRequestURL()
[::1]:8080	[	NumberFormatException	NumberFormatException
[2001:db8::1]	2001	NumberFormatException	NumberFormatException
[::1]	::1	80	http://::1/path

so a handler that calls getPort() or getRequestURL() responds with 400 on every server.

The port of an IPv6 address is now taken after the closing bracket, and an address without brackets (getHostAndPort() returns [::1] as ::1) has no port. getHost() returns the address in brackets, as it appears in the Host header and as ProxyPeerAddress already sets it for X-Forwarded-Host. With that, getRequestURL() builds http://[::1]:8080/path. getHostAndPort() and the results for host names and IPv4 addresses don't change.

Tests: DefaultContextTest has new cases for [2001:db8::1]:8080, for [2001:db8::1] with the default port, for getRequestURL() with [::1]:8080, and an extra getHost() assertion in hostAndPortIPv6. All four fail without the change. mvn test passes in the jooby module (1310 tests), and google-java-format reports nothing on the changed lines.

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.19%. Comparing base (3a1ee0b) to head (d55d4e7).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
jooby/src/main/java/io/jooby/DefaultContext.java	83.33%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4030      +/-   ##
============================================
+ Coverage     94.17%   94.19%   +0.01%     
- Complexity     6667     6674       +7     
============================================
  Files           432      432              
  Lines         20914    20923       +9     
  Branches       2102     2106       +4     
============================================
+ Hits          19696    19708      +12     
+ Misses          764      760       -4     
- Partials        454      455       +1     

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