net/http: use slices to simplify the code

"strSliceContains" is replaced by "slices.Contains".

Replace "sort.Strings" with "slices.Sort" since it becomes a wrapper
of "slices.Sort" from Go 1.22.

"headerSorter" no longer has to implement "sort.Interface". We use
"slice.SortFunc" to sort kvs.

src/net/http/client.go

@@ -20,7 +20,7 @@ import (
 	"net/http/internal/ascii"
 	"net/url"
 	"reflect"
-	"sort"
+	"slices"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -787,7 +787,7 @@ func (c *Client) makeHeadersCopier(ireq *Request) func(*Request) {
 						ss = append(ss, c.Name+"="+c.Value)
 					}
 				}
-				sort.Strings(ss) // Ensure deterministic headers
+				slices.Sort(ss) // Ensure deterministic headers
 				ireqhdr.Set("Cookie", strings.Join(ss, "; "))
 			}
 		}

src/net/http/export_test.go

@@ -12,7 +12,7 @@ import (
 	"fmt"
 	"net"
 	"net/url"
-	"sort"
+	"slices"
 	"sync"
 	"testing"
 	"time"
@@ -111,7 +111,7 @@ func (t *Transport) IdleConnKeysForTesting() (keys []string) {
 	for key := range t.idleConn {
 		keys = append(keys, key.String())
 	}
-	sort.Strings(keys)
+	slices.Sort(keys)
 	return
 }
 
@@ -130,7 +130,7 @@ func (t *Transport) IdleConnStrsForTesting() []string {
 			ret = append(ret, pc.conn.LocalAddr().String()+"/"+pc.conn.RemoteAddr().String())
 		}
 	}
-	sort.Strings(ret)
+	slices.Sort(ret)
 	return ret
 }
 
@@ -150,7 +150,7 @@ func (t *Transport) IdleConnStrsForTesting_h2() []string {
 		}
 	}
 
-	sort.Strings(ret)
+	slices.Sort(ret)
 	return ret
 }
 

src/net/http/header.go

@@ -9,7 +9,7 @@ import (
 	"net/http/httptrace"
 	"net/http/internal/ascii"
 	"net/textproto"
-	"sort"
+	"slices"
 	"strings"
 	"sync"
 	"time"
@@ -152,17 +152,11 @@ type keyValues struct {
 	values []string
 }
 
-// A headerSorter implements sort.Interface by sorting a []keyValues
-// by key. It's used as a pointer, so it can fit in a sort.Interface
-// interface value without allocation.
+// headerSorter contains a slice of keyValues sorted by keyValues.key.
 type headerSorter struct {
 	kvs []keyValues
 }
 
-func (s *headerSorter) Len() int           { return len(s.kvs) }
-func (s *headerSorter) Swap(i, j int)      { s.kvs[i], s.kvs[j] = s.kvs[j], s.kvs[i] }
-func (s *headerSorter) Less(i, j int) bool { return s.kvs[i].key < s.kvs[j].key }
-
 var headerSorterPool = sync.Pool{
 	New: func() any { return new(headerSorter) },
 }
@@ -182,7 +176,7 @@ func (h Header) sortedKeyValues(exclude map[string]bool) (kvs []keyValues, hs *h
 		}
 	}
 	hs.kvs = kvs
-	sort.Sort(hs)
+	slices.SortFunc(hs.kvs, func(a, b keyValues) int { return strings.Compare(a.key, b.key) })
 	return kvs, hs
 }
 

src/net/http/main_test.go

@@ -11,7 +11,7 @@ import (
 	"net/http"
 	"os"
 	"runtime"
-	"sort"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -50,7 +50,7 @@ func interestingGoroutines() (gs []string) {
 		}
 		gs = append(gs, stack)
 	}
-	sort.Strings(gs)
+	slices.Sort(gs)
 	return
 }
 

src/net/http/routing_index_test.go

@@ -7,7 +7,6 @@ package http
 import (
 	"fmt"
 	"slices"
-	"sort"
 	"strings"
 	"testing"
 )
@@ -35,7 +34,7 @@ func trueConflicts(pat *pattern, pats []*pattern) []string {
 			s = append(s, p.String())
 		}
 	}
-	sort.Strings(s)
+	slices.Sort(s)
 	return s
 }
 
@@ -47,7 +46,7 @@ func indexConflicts(pat *pattern, idx *routingIndex) []string {
 		}
 		return nil
 	})
-	sort.Strings(s)
+	slices.Sort(s)
 	return slices.Compact(s)
 }
 

src/net/http/routing_tree_test.go

@@ -7,7 +7,6 @@ package http
 import (
 	"fmt"
 	"io"
-	"sort"
 	"strings"
 	"testing"
 
@@ -261,7 +260,7 @@ func TestMatchingMethods(t *testing.T) {
 			ms := map[string]bool{}
 			test.tree.matchingMethods(test.host, test.path, ms)
 			keys := mapKeys(ms)
-			sort.Strings(keys)
+			slices.Sort(keys)
 			got := strings.Join(keys, ",")
 			if got != test.want {
 				t.Errorf("got %s, want %s", got, test.want)
@@ -285,7 +284,7 @@ func (n *routingNode) print(w io.Writer, level int) {
 		keys = append(keys, k)
 		return true
 	})
-	sort.Strings(keys)
+	slices.Sort(keys)
 
 	for _, k := range keys {
 		fmt.Fprintf(w, "%s%q:\n", indent, k)

src/net/http/server.go

@@ -23,7 +23,7 @@ import (
 	urlpkg "net/url"
 	"path"
 	"runtime"
-	"sort"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -2652,7 +2652,7 @@ func (mux *ServeMux) matchingMethods(host, path string) []string {
 	// matchOrRedirect will try appending a trailing slash if there is no match.
 	mux.tree.matchingMethods(host, path+"/", ms)
 	methods := mapKeys(ms)
-	sort.Strings(methods)
+	slices.Sort(methods)
 	return methods
 }
 
@@ -3206,7 +3206,7 @@ func (srv *Server) shouldConfigureHTTP2ForServe() bool {
 	// passed this tls.Config to tls.NewListener. And if they did,
 	// it's too late anyway to fix it. It would only be potentially racy.
 	// See Issue 15908.
-	return strSliceContains(srv.TLSConfig.NextProtos, http2NextProtoTLS)
+	return slices.Contains(srv.TLSConfig.NextProtos, http2NextProtoTLS)
 }
 
 // ErrServerClosed is returned by the [Server.Serve], [ServeTLS], [ListenAndServe],
@@ -3308,7 +3308,7 @@ func (srv *Server) ServeTLS(l net.Listener, certFile, keyFile string) error {
 	}
 
 	config := cloneTLSConfig(srv.TLSConfig)
-	if !strSliceContains(config.NextProtos, "http/1.1") {
+	if !slices.Contains(config.NextProtos, "http/1.1") {
 		config.NextProtos = append(config.NextProtos, "http/1.1")
 	}
 
@@ -3815,15 +3815,6 @@ func numLeadingCRorLF(v []byte) (n int) {
 	return
 }
 
-func strSliceContains(ss []string, s string) bool {
-	for _, v := range ss {
-		if v == s {
-			return true
-		}
-	}
-	return false
-}
-
 // tlsRecordHeaderLooksLikeHTTP reports whether a TLS record header
 // looks like it might've been a misdirected plaintext HTTP request.
 func tlsRecordHeaderLooksLikeHTTP(hdr [5]byte) bool {

src/net/http/transfer.go

@@ -16,7 +16,7 @@ import (
 	"net/http/internal/ascii"
 	"net/textproto"
 	"reflect"
-	"sort"
+	"slices"
 	"strconv"
 	"strings"
 	"sync"
@@ -318,7 +318,7 @@ func (t *transferWriter) writeHeader(w io.Writer, trace *httptrace.ClientTrace)
 			keys = append(keys, k)
 		}
 		if len(keys) > 0 {
-			sort.Strings(keys)
+			slices.Sort(keys)
 			// TODO: could do better allocation-wise here, but trailers are rare,
 			// so being lazy for now.
 			if _, err := io.WriteString(w, "Trailer: "+strings.Join(keys, ",")+"\r\n"); err != nil {