fix:更新已知bug,优化代码

vendor/guzzlehttp/psr7/README.md

@@ -380,10 +380,28 @@ of the header. When a parameter does not contain a value, but just
 contains a key, this function will inject a key with a '' string value.
 
 
-## `GuzzleHttp\Psr7\Header::normalize`
+## `GuzzleHttp\Psr7\Header::splitList`
+
+`public static function splitList(string|string[] $header): string[]`
+
+Splits a HTTP header defined to contain a comma-separated list into
+each individual value:
+
+```
+$knownEtags = Header::splitList($request->getHeader('if-none-match'));
+```
+
+Example headers include `accept`, `cache-control` and `if-none-match`.
+
+
+## `GuzzleHttp\Psr7\Header::normalize` (deprecated)
 
 `public static function normalize(string|array $header): array`
 
+`Header::normalize()` is deprecated in favor of [`Header::splitList()`](README.md#guzzlehttppsr7headersplitlist)
+which performs the same operation with a cleaned up API and improved
+documentation.
+
 Converts an array of header values that may contain comma separated
 headers into an array of headers with no comma separated values.