Validate request headers in H3Stream.

Override QuicSpdyServerStreamBase::ValidateReceivedHeaders() in H3Stream to
allow uppercase characters in header names. (CONNECT method is currently not
implemented.)

PiperOrigin-RevId: 574867858

quiche/http2/adapter/header_validator.cc

diff --git a/quiche/http2/adapter/header_validator.cc b/quiche/http2/adapter/header_validator.cc
index 12e01eb..d091fde 100644
--- a/quiche/http2/adapter/header_validator.cc
+++ b/quiche/http2/adapter/header_validator.cc
@@ -74,12 +74,6 @@
   return true;
 }
 
-bool IsValidHeaderName(absl::string_view name) {
-  static const CharMap valid_chars =
-      BuildValidCharMap(kHttp2HeaderNameAllowedChars);
-  return AllCharsInMap(name, valid_chars);
-}
-
 bool IsValidStatus(absl::string_view status) {
   static const CharMap valid_chars =
       BuildValidCharMap(kHttp2StatusValueAllowedChars);
@@ -240,6 +234,12 @@
   return false;
 }
 
+bool HeaderValidator::IsValidHeaderName(absl::string_view name) {
+  static const CharMap valid_chars =
+      BuildValidCharMap(kHttp2HeaderNameAllowedChars);
+  return AllCharsInMap(name, valid_chars);
+}
+
 bool HeaderValidator::IsValidHeaderValue(absl::string_view value,
                                          ObsTextOption option) {
   static const CharMap valid_chars =

quiche/http2/adapter/header_validator.h

diff --git a/quiche/http2/adapter/header_validator.h b/quiche/http2/adapter/header_validator.h
index e9ebc8d..f1c8497 100644
--- a/quiche/http2/adapter/header_validator.h
+++ b/quiche/http2/adapter/header_validator.h
@@ -26,8 +26,13 @@
   // present for the given header type.
   bool FinishHeaderBlock(HeaderType type) override;
 
-  // Returns whether `value` is valid according to RFC 9110 Section 5.5 and RFC
-  // 9112 Section 8.2.1.
+  // Returns whether `name` is valid according to RFC 9110 Section 5.1.
+  // ':' is an invalid character, therefore HTTP/2 pseudo-headers must be
+  // validated with the leading colon removed.
+  static bool IsValidHeaderName(absl::string_view name);
+
+  // Returns whether `value` is valid according to RFC 9110 Section 5.5 and
+  // RFC 9113 Section 8.2.1.
   static bool IsValidHeaderValue(absl::string_view value,
                                  ObsTextOption ops_text_option);