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doc/go1.22.html: release notes for slog, testing/slogtest and net/http.ServeMux

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Updates #61422.

Change-Id: I8f2dfe92405f409c46465bbb5714eff662ce9b49
Reviewed-on: https://go-review.googlesource.com/c/go/+/550776
Run-TryBot: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
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Jonathan Amsterdam 2023-12-18 13:07:07 -05:00
parent 6fe0d3758b
commit 1d4b0b6236
1 changed files with 46 additions and 15 deletions
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@ -359,6 +359,45 @@ and the Go runtime also use ChaCha8 for randomness.
We plan to include an API migration tool in a future release, likely Go 1.23.
</p>
<h3 id="enhanced_routing_patterns"</h3>
<p><!-- https://go.dev/issue/61410 -->
HTTP routing in the standard library is now more expressive.
The patterns used by <a href="/pkg/net/http#ServeMux"><code>net/http.ServeMux</code></a> have been enhanced to accept methods and wildcards.
</p>
<p>
Registering a handler with a method, like <code>"POST /items/create"</code>, restricts
invocations of the handler to requests with the given method. A pattern with a method takes precedence over a matching pattern without one.
As a special case, registering a handler with <code> "GET"</code> also registers it with <code>"HEAD"</code>.
</p>
<p>
Wildcards in patterns, like <code>/items/{id}</code>, match segments of the URL path.
The actual segment value may be accessed by calling the <a href="/pkg/net/http#Request.PathValue"><code>Request.PathValue</code></a> method.
A wildcard ending in "...", like <code>/files/{path...}</code>, must occur at the end of a pattern and matches all the remaining segments.
</p>
<p>
A pattern that ends in "/" matches all paths that have it as a prefix, as always.
To match the exact pattern including the trailing slash, end it with <code>{$}</code>,
as in <code>/exact/match/{$}</code>.
</p>
<p>
If two patterns overlap in the requests that they match, then the more specific pattern takes precedence.
If neither is more specific, the patterns conflict.
This rule generalizes the original precedence rules and maintains the property that the order in which
patterns are registered does not matter.
</p>
<p>
This change breaks backwards compatiblity in small ways, some obvious&mdash;patterns with "{" and "}" behave differently&mdash;
and some less so&mdash;treatment of escaped paths has been improved.
The change is controlled by a <a href="/doc/godebug"><code>GODEBUG</code></a> field named <code>httpmuxgo121</code>.
Set <code>httpmuxgo121=1</code> to restore the old behavior.
</p>
<h3 id="minor_library_changes">Minor changes to the library</h3>
<p>
@ -633,14 +672,13 @@ We plan to include an API migration tool in a future release, likely Go 1.23.
<dl id="log/slog"><dt><a href="/pkg/log/slog/">log/slog</a></dt>
<dd>
<p><!-- https://go.dev/issue/62418 -->
TODO: <a href="https://go.dev/issue/62418">https://go.dev/issue/62418</a>: enable setting level on default log.Logger
</p>
<p><!-- CL 525096 -->
TODO: <a href="https://go.dev/cl/525096">https://go.dev/cl/525096</a>: log/slog: add LogLoggerLevel to enable setting level on the default logger; modified api/next/62418.txt
The new <a href="/pkg/log/slog#SetLogLoggerLevel"><code>SetLogLoggerLevel</code></a> function
controls the level for the bridge between the `slog` and `log` packages. It sets the minimum level
for calls to the top-level `slog` logging functions, and it sets the level for calls to `log.Logger`
that go through `slog`.
</p>
</dd>
</dl><!-- log/slog -->
</dl>
<dl id="math/big"><dt><a href="/pkg/math/big/">math/big</a></dt>
<dd>
@ -682,10 +720,6 @@ We plan to include an API migration tool in a future release, likely Go 1.23.
operating on an <code>fs.FS</code>.
</p>
<p><!-- https://go.dev/issue/61410 -->
TODO: <a href="https://go.dev/issue/61410">https://go.dev/issue/61410</a>: enhanced ServeMux routing
</p>
<p><!-- https://go.dev/issue/61679 -->
The HTTP server and client now reject requests and responses containing
an invalid empty <code>Content-Length</code> header.
@ -925,11 +959,8 @@ We plan to include an API migration tool in a future release, likely Go 1.23.
<dl id="testing/slogtest"><dt><a href="/pkg/testing/slogtest/">testing/slogtest</a></dt>
<dd>
<p><!-- https://go.dev/issue/61758 -->
TODO: <a href="https://go.dev/issue/61758">https://go.dev/issue/61758</a>: support sub-tests
</p>
<p><!-- CL 516076 -->
TODO: <a href="https://go.dev/cl/516076">https://go.dev/cl/516076</a>: testing/slogtest: add Run to run cases as subtests; modified api/next/61758.txt
The new <a href="/pkg/testing/slogtest#Run"><code>Run</code></a> function uses sub-tests to run test cases,
providing finer-grained control.
</p>
</dd>
</dl><!-- testing/slogtest -->