explicit naming of headerCapacityKV value in kvBuffer.Reset

http/httpraw/form_test.go

@@ -148,7 +148,7 @@ func TestFormParseReuseNoAlloc(t *testing.T) {
 		t.Fatal(err)
 	}
 	allocs := testing.AllocsPerRun(100, func() {
-		f.Reset(body, 0)
+		f.Reset(body, 0) // 0 preserves the pair storage warmed up above, the reuse under test.
 		f.Parse()
 	})
 	if allocs != 0 {
@@ -161,7 +161,7 @@ func TestFormParseReuseNoAlloc(t *testing.T) {
 // one. Form.Len is zero until Parse runs and cannot answer that.
 func TestFormBufferUsed(t *testing.T) {
 	var f Form
-	f.Reset(nil, 0)
+	f.Reset(nil, defaultKVCap)
 	if got := f.BufferUsed(); got != 0 {
 		t.Errorf("want 0 on a fresh form, got %d", got)
 	}
@@ -191,7 +191,7 @@ func TestFormBufferUsed(t *testing.T) {
 		t.Errorf("BufferUsed must not change on Parse, got %d", got)
 	}
 	// Reset discards the pairs and the buffered bytes with them.
-	f.Reset(nil, 0)
+	f.Reset(nil, defaultKVCap)
 	if got := f.BufferUsed(); got != 0 {
 		t.Errorf("want 0 after Reset, got %d", got)
 	}

http/httpraw/header_test.go

@@ -11,7 +11,11 @@ import (
 	"time"
 )
 
-const numHeaderCapacity = 16
+// defaultKVCap is the key/value table size tests hand to Reset. A Reset with 0
+// preserves whatever capacity the value already had, which is what production
+// code wants on reuse but leaves a fresh value unable to hold a single pair when
+// growth is disabled, see [Form.Reset].
+const defaultKVCap = 16
 
 func TestHeaderParseRequest(t *testing.T) {
 	const (
@@ -62,7 +66,7 @@ func TestHeaderParseRequest(t *testing.T) {
 	}
 	var c Cookie
 	cookie := hdr.Get("Cookie")
-	c.Reset(cookie, 0)
+	c.Reset(cookie, defaultKVCap)
 	err = c.Parse()
 	if err != nil {
 		t.Error(err)
@@ -394,7 +398,7 @@ func TestCopyDecodedPercentURLInPlace(t *testing.T) {
 
 func TestHeaderSetOverwrite(t *testing.T) {
 	var h Header
-	h.Reset(nil, numHeaderCapacity)
+	h.Reset(nil, defaultKVCap)
 	h.SetMethod("GET")
 	h.SetRequestTarget("/")
 	h.SetProtocol("HTTP/1.1")
@@ -417,7 +421,7 @@ func TestHeaderSetOverwrite(t *testing.T) {
 
 func TestHeaderSetBytesEmptyValue(t *testing.T) {
 	var h Header
-	h.Reset(nil, numHeaderCapacity)
+	h.Reset(nil, defaultKVCap)
 	h.SetBytes("X-Empty", nil)
 	if got := h.Get("X-Empty"); len(got) != 0 {
 		t.Errorf("want empty value, got %q", got)
@@ -472,7 +476,7 @@ func TestHeader_SplitBeforeColonStillParses(t *testing.T) {
 	const part2 = ": example.com\r\n\r\n"
 
 	var h Header
-	h.Reset(nil, numHeaderCapacity)
+	h.Reset(nil, defaultKVCap)
 	if err := h.ReadFromBytes([]byte(part1)); err != nil {
 		t.Fatal(err)
 	}
@@ -505,7 +509,7 @@ func TestHeader_AppendHeaderExactCapNoPanic(t *testing.T) {
 	const key, value = "K", "V"
 	buf := make([]byte, 0, len(key)+len(value)) // exact cap, no slack.
 	var h Header
-	h.Reset(buf, numHeaderCapacity)
+	h.Reset(buf, defaultKVCap)
 	defer func() {
 		if r := recover(); r != nil {
 			t.Fatalf("appendHeader panicked on exact-cap buffer: %v", r)
@@ -522,7 +526,7 @@ func TestHeader_AppendHeaderExactCapNoPanic(t *testing.T) {
 func TestHeader_AddFullBufferNoPanic(t *testing.T) {
 	buf := make([]byte, 0, 40) // Small cap; enough for Reset (len 0) but not the field below.
 	var h Header
-	h.Reset(buf, numHeaderCapacity)
+	h.Reset(buf, defaultKVCap)
 	h.ConfigBufferGrowth(false)
 	h.SetMethod("GET")
 	h.SetRequestTarget("/")
@@ -557,7 +561,7 @@ func TestHeader_SetInt(t *testing.T) {
 	} {
 		t.Run(tc.name, func(t *testing.T) {
 			var h Header
-			h.Reset(nil, numHeaderCapacity)
+			h.Reset(nil, defaultKVCap)
 			h.SetInt("Content-Length", tc.value, tc.base)
 			if got := string(h.Get("Content-Length")); got != tc.want {
 				t.Fatalf("want %q, got %q", tc.want, got)
@@ -569,7 +573,7 @@ func TestHeader_SetInt(t *testing.T) {
 // SetInt on an existing key must reuse the slot in place (single field, latest value).
 func TestHeader_SetIntOverwrite(t *testing.T) {
 	var h Header
-	h.Reset(nil, numHeaderCapacity)
+	h.Reset(nil, defaultKVCap)
 	h.SetMethod("GET")
 	h.SetRequestTarget("/")
 	h.SetProtocol("HTTP/1.1")
@@ -593,7 +597,7 @@ func TestHeader_SetIntOverwrite(t *testing.T) {
 func TestHeader_SetIntNoAlloc(t *testing.T) {
 	buf := make([]byte, 0, 256)
 	var h Header
-	h.Reset(buf, numHeaderCapacity)
+	h.Reset(buf, defaultKVCap)
 	h.ConfigBufferGrowth(false)
 	h.Add("Content-Length", "0000000000000000000000") // pre-size a reusable slot.
 	allocs := testing.AllocsPerRun(100, func() {
@@ -623,7 +627,7 @@ func TestHeader_FieldTableSizedFromBuffer(t *testing.T) {
 	raw.WriteString("X-Canary: " + wantVal + "\r\n\r\n")
 
 	var h Header
-	h.Reset(make([]byte, 0, 8192), numHeaderCapacity) // Room for the block with plenty to spare.
+	h.Reset(make([]byte, 0, 8192), defaultKVCap) // Room for the block with plenty to spare.
 	err := h.ParseBytes(false, []byte(raw.String()))
 	if err != nil {
 		t.Fatalf("parsing a 42 field request into an 8kB buffer: %s", err)
@@ -646,7 +650,7 @@ func TestHeader_FieldTableFullIsReported(t *testing.T) {
 	}
 	raw.WriteString("\r\n")
 	var h Header
-	h.Reset(make([]byte, 0, 512), numHeaderCapacity)
+	h.Reset(make([]byte, 0, 512), defaultKVCap)
 	h.ConfigBufferGrowth(false)
 	err := h.ParseBytes(false, []byte(raw.String()))
 	if !errors.Is(err, ErrHeaderTooMany) {

http/httpraw/parse_test.go

@@ -10,7 +10,7 @@ func TestTryParse_IncrementalRequest(t *testing.T) {
 	// Full HTTP request split across multiple ReadFromBytes calls.
 	full := "GET /index.html HTTP/1.1\r\nHost: example.com\r\nContent-Type: text/html\r\n\r\nbody here"
 	var hdr Header
-	hdr.Reset(make([]byte, 0, 256), numHeaderCapacity)
+	hdr.Reset(make([]byte, 0, 256), defaultKVCap)
 
 	// Feed data in small chunks to exercise incremental parsing.
 	chunks := splitInto(full, 10)
@@ -79,7 +79,7 @@ func TestTryParse_IncrementalRequest(t *testing.T) {
 func TestTryParse_IncrementalResponse(t *testing.T) {
 	full := "HTTP/1.1 200 OK\r\nContent-Length: 5\r\nServer: lneto\r\n\r\nhello"
 	var hdr Header
-	hdr.Reset(make([]byte, 0, 256), numHeaderCapacity)
+	hdr.Reset(make([]byte, 0, 256), defaultKVCap)
 
 	chunks := splitInto(full, 8)
 	var done bool
@@ -131,7 +131,7 @@ func TestReadFromLimited(t *testing.T) {
 	r := strings.NewReader(data)
 
 	var hdr Header
-	hdr.Reset(make([]byte, 0, 256), numHeaderCapacity)
+	hdr.Reset(make([]byte, 0, 256), defaultKVCap)
 
 	// Read in one shot.
 	n, err := hdr.ReadFromLimited(r, 256)
@@ -157,7 +157,7 @@ func TestReadFromLimited(t *testing.T) {
 
 func TestReadFromLimited_MaxBytes(t *testing.T) {
 	var hdr Header
-	hdr.Reset(make([]byte, 0, 256), numHeaderCapacity)
+	hdr.Reset(make([]byte, 0, 256), defaultKVCap)
 
 	// Zero maxBytesToRead should error.
 	_, err := hdr.ReadFromLimited(strings.NewReader("data"), 0)
@@ -168,7 +168,7 @@ func TestReadFromLimited_MaxBytes(t *testing.T) {
 
 func TestReadFromBytes_Empty(t *testing.T) {
 	var hdr Header
-	hdr.Reset(make([]byte, 0, 256), numHeaderCapacity)
+	hdr.Reset(make([]byte, 0, 256), defaultKVCap)
 
 	err := hdr.ReadFromBytes(nil)
 	if err == nil {
@@ -178,7 +178,7 @@ func TestReadFromBytes_Empty(t *testing.T) {
 
 func TestBufferFreeAndCapacity(t *testing.T) {
 	var hdr Header
-	hdr.Reset(make([]byte, 0, 100), numHeaderCapacity)
+	hdr.Reset(make([]byte, 0, 100), defaultKVCap)
 
 	if hdr.BufferCapacity() != 100 {
 		t.Errorf("capacity = %d; want 100", hdr.BufferCapacity())
@@ -196,7 +196,7 @@ func TestBufferFreeAndCapacity(t *testing.T) {
 func TestEnableBufferGrowth(t *testing.T) {
 	var hdr Header
 	buf := make([]byte, 0, 64)
-	hdr.Reset(buf, numHeaderCapacity)
+	hdr.Reset(buf, defaultKVCap)
 	hdr.ConfigBufferGrowth(false)
 	// With growth disabled, reading more than capacity should fail.
 	big := make([]byte, 128)
@@ -387,7 +387,7 @@ func TestHeader_MultilineValue(t *testing.T) {
 
 func TestHeader_ResponseRoundTrip(t *testing.T) {
 	var hdr Header
-	hdr.Reset(make([]byte, 0, 256), numHeaderCapacity)
+	hdr.Reset(make([]byte, 0, 256), defaultKVCap)
 	hdr.SetProtocol("HTTP/1.1")
 	hdr.SetStatus("404", "Not Found")
 	hdr.Add("Content-Type", "text/plain")
@@ -427,7 +427,7 @@ func TestHeader_ResponseRoundTrip(t *testing.T) {
 
 func TestHeader_RequestRoundTrip(t *testing.T) {
 	var hdr Header
-	hdr.Reset(make([]byte, 0, 256), numHeaderCapacity)
+	hdr.Reset(make([]byte, 0, 256), defaultKVCap)
 	hdr.SetProtocol("HTTP/1.1")
 	hdr.SetMethod("POST")
 	hdr.SetRequestTarget("/api/data")