[http] Remove legacy codecs

bazel/BUILD

@@ -284,11 +284,6 @@ config_setting(
     values = {"define": "path_normalization_by_default=true"},
 )
 
-config_setting(
-    name = "enable_legacy_codecs_in_integration_tests",
-    values = {"define": "use_new_codecs_in_integration_tests=false"},
-)
-
 cc_proto_library(
     name = "grpc_health_proto",
     deps = ["@com_github_grpc_grpc//src/proto/grpc/health/v1:_health_proto_only"],

bazel/envoy_build_system.bzl

@@ -18,7 +18,6 @@ load(
     _envoy_select_boringssl = "envoy_select_boringssl",
     _envoy_select_google_grpc = "envoy_select_google_grpc",
     _envoy_select_hot_restart = "envoy_select_hot_restart",
-    _envoy_select_new_codecs_in_integration_tests = "envoy_select_new_codecs_in_integration_tests",
     _envoy_select_wasm = "envoy_select_wasm",
     _envoy_select_wasm_v8 = "envoy_select_wasm_v8",
     _envoy_select_wasm_wasmtime = "envoy_select_wasm_wasmtime",
@@ -195,7 +194,6 @@ envoy_select_wasm = _envoy_select_wasm
 envoy_select_wasm_wavm = _envoy_select_wasm_wavm
 envoy_select_wasm_wasmtime = _envoy_select_wasm_wasmtime
 envoy_select_wasm_v8 = _envoy_select_wasm_v8
-envoy_select_new_codecs_in_integration_tests = _envoy_select_new_codecs_in_integration_tests
 
 # Binary wrappers (from envoy_binary.bzl)
 envoy_cc_binary = _envoy_cc_binary

bazel/envoy_select.bzl

@@ -58,10 +58,3 @@ def envoy_select_wasm_wasmtime(xs):
         "@envoy//bazel:wasm_wasmtime": xs,
         "//conditions:default": [],
     })
-
-# Select the given values by default and remove if use new codecs are disabled for current build.
-def envoy_select_new_codecs_in_integration_tests(xs, repository = ""):
-    return select({
-        repository + "//bazel:enable_legacy_codecs_in_integration_tests": [],
-        "//conditions:default": xs,
-    })

ci/do_ci.sh

@@ -282,7 +282,6 @@ elif [[ "$CI_TARGET" == "bazel.compile_time_options" ]]; then
     "--define" "quiche=enabled"
     "--define" "path_normalization_by_default=true"
     "--define" "deprecated_features=disabled"
-    "--define" "use_new_codecs_in_integration_tests=false"
     "--define" "tcmalloc=gperftools"
     "--define" "zlib=ng"
     "--@envoy//source/extensions/filters/http/kill_request:enabled"

docs/root/version_history/current.rst

@@ -54,6 +54,7 @@ Removed Config or Runtime
 * ext_authz: removed auto ignore case in HTTP-based `ext_authz` header matching and the runtime guard `envoy.reloadable_features.ext_authz_http_service_enable_case_sensitive_string_matcher`. To ignore case, set the :ref:`ignore_case <envoy_api_field_type.matcher.StringMatcher.ignore_case>` field to true.
 * http: flip default HTTP/1 and HTTP/2 server codec implementations to new codecs that remove the use of exceptions for control flow. To revert to old codec behavior, set the runtime feature `envoy.reloadable_features.new_codec_behavior` to false.
 * http: removed `envoy.reloadable_features.http1_flood_protection` and legacy code path for turning flood protection off.
+* http: removed `envoy.reloadable_features.new_codec_behavior` and legacy codecs.
 
 New Features
 ------------

source/common/http/BUILD

@@ -58,21 +58,16 @@ envoy_cc_library(
         "//include/envoy/http:codec_interface",
         "//include/envoy/network:connection_interface",
         "//include/envoy/network:filter_interface",
-        "//include/envoy/runtime:runtime_interface",
         "//source/common/common:assert_lib",
         "//source/common/common:enum_to_int",
         "//source/common/common:linked_object",
         "//source/common/common:minimal_logger_lib",
         "//source/common/config:utility_lib",
-        "//source/common/http/http1:codec_legacy_lib",
         "//source/common/http/http1:codec_lib",
-        "//source/common/http/http2:codec_legacy_lib",
         "//source/common/http/http2:codec_lib",
         "//source/common/http/http3:quic_codec_factory_lib",
         "//source/common/http/http3:well_known_names",
         "//source/common/network:filter_lib",
-        "//source/common/runtime:runtime_features_lib",
-        "//source/common/runtime:runtime_lib",
     ],
 )
 
@@ -233,9 +228,7 @@ envoy_cc_library(
         "//source/common/common:scope_tracker",
         "//source/common/common:utility_lib",
         "//source/common/config:utility_lib",
-        "//source/common/http/http1:codec_legacy_lib",
         "//source/common/http/http1:codec_lib",
-        "//source/common/http/http2:codec_legacy_lib",
         "//source/common/http/http2:codec_lib",
         "//source/common/http/http3:quic_codec_factory_lib",
         "//source/common/http/http3:well_known_names",

source/common/http/codec_client.cc

@@ -9,15 +9,11 @@
 #include "common/config/utility.h"
 #include "common/http/exception.h"
 #include "common/http/http1/codec_impl.h"
-#include "common/http/http1/codec_impl_legacy.h"
 #include "common/http/http2/codec_impl.h"
-#include "common/http/http2/codec_impl_legacy.h"
 #include "common/http/http3/quic_codec_factory.h"
 #include "common/http/http3/well_known_names.h"
 #include "common/http/status.h"
 #include "common/http/utility.h"
-#include "common/runtime/runtime_features.h"
-#include "common/runtime/runtime_impl.h"
 
 namespace Envoy {
 namespace Http {
@@ -155,15 +151,9 @@ CodecClientProd::CodecClientProd(Type type, Network::ClientConnectionPtr&& conne
 
   switch (type) {
   case Type::HTTP1: {
-    if (Runtime::runtimeFeatureEnabled("envoy.reloadable_features.new_codec_behavior")) {
-      codec_ = std::make_unique<Http1::ClientConnectionImpl>(
-          *connection_, host->cluster().http1CodecStats(), *this, host->cluster().http1Settings(),
-          host->cluster().maxResponseHeadersCount());
-    } else {
-      codec_ = std::make_unique<Legacy::Http1::ClientConnectionImpl>(
-          *connection_, host->cluster().http1CodecStats(), *this, host->cluster().http1Settings(),
-          host->cluster().maxResponseHeadersCount());
-    }
+    codec_ = std::make_unique<Http1::ClientConnectionImpl>(
+        *connection_, host->cluster().http1CodecStats(), *this, host->cluster().http1Settings(),
+        host->cluster().maxResponseHeadersCount());
     break;
   }
   case Type::HTTP2: {

source/common/http/conn_manager_utility.cc

@@ -11,9 +11,7 @@
 #include "common/http/header_utility.h"
 #include "common/http/headers.h"
 #include "common/http/http1/codec_impl.h"
-#include "common/http/http1/codec_impl_legacy.h"
 #include "common/http/http2/codec_impl.h"
-#include "common/http/http2/codec_impl_legacy.h"
 #include "common/http/path_utility.h"
 #include "common/http/utility.h"
 #include "common/network/utility.h"
@@ -53,26 +51,14 @@ ServerConnectionPtr ConnectionManagerUtility::autoCreateCodec(
         headers_with_underscores_action) {
   if (determineNextProtocol(connection, data) == Utility::AlpnNames::get().Http2) {
     Http2::CodecStats& stats = Http2::CodecStats::atomicGet(http2_codec_stats, scope);
-    if (Runtime::runtimeFeatureEnabled("envoy.reloadable_features.new_codec_behavior")) {
-      return std::make_unique<Http2::ServerConnectionImpl>(
-          connection, callbacks, stats, random, http2_options, max_request_headers_kb,
-          max_request_headers_count, headers_with_underscores_action);
-    } else {
-      return std::make_unique<Legacy::Http2::ServerConnectionImpl>(
-          connection, callbacks, stats, random, http2_options, max_request_headers_kb,
-          max_request_headers_count, headers_with_underscores_action);
-    }
+    return std::make_unique<Http2::ServerConnectionImpl>(
+        connection, callbacks, stats, random, http2_options, max_request_headers_kb,
+        max_request_headers_count, headers_with_underscores_action);
   } else {
     Http1::CodecStats& stats = Http1::CodecStats::atomicGet(http1_codec_stats, scope);
-    if (Runtime::runtimeFeatureEnabled("envoy.reloadable_features.new_codec_behavior")) {
-      return std::make_unique<Http1::ServerConnectionImpl>(
-          connection, stats, callbacks, http1_settings, max_request_headers_kb,
-          max_request_headers_count, headers_with_underscores_action);
-    } else {
-      return std::make_unique<Legacy::Http1::ServerConnectionImpl>(
-          connection, stats, callbacks, http1_settings, max_request_headers_kb,
-          max_request_headers_count, headers_with_underscores_action);
-    }
+    return std::make_unique<Http1::ServerConnectionImpl>(
+        connection, stats, callbacks, http1_settings, max_request_headers_kb,
+        max_request_headers_count, headers_with_underscores_action);
   }
 }
 

source/common/http/http1/BUILD

@@ -24,45 +24,36 @@ envoy_cc_library(
     ],
 )
 
-CODEC_LIB_DEPS = [
-    ":codec_stats_lib",
-    ":header_formatter_lib",
-    "//include/envoy/buffer:buffer_interface",
-    "//include/envoy/http:codec_interface",
-    "//include/envoy/http:header_map_interface",
-    "//include/envoy/network:connection_interface",
-    "//source/common/buffer:buffer_lib",
-    "//source/common/buffer:watermark_buffer_lib",
-    "//source/common/common:assert_lib",
-    "//source/common/common:statusor_lib",
-    "//source/common/common:utility_lib",
-    "//source/common/grpc:common_lib",
-    "//source/common/http:codec_helper_lib",
-    "//source/common/http:codes_lib",
-    "//source/common/http:exception_lib",
-    "//source/common/http:header_map_lib",
-    "//source/common/http:header_utility_lib",
-    "//source/common/http:headers_lib",
-    "//source/common/http:status_lib",
-    "//source/common/http:utility_lib",
-    "//source/common/runtime:runtime_features_lib",
-    "@envoy_api//envoy/config/core/v3:pkg_cc_proto",
-]
-
 envoy_cc_library(
     name = "codec_lib",
     srcs = ["codec_impl.cc"],
     hdrs = ["codec_impl.h"],
     external_deps = ["http_parser"],
-    deps = CODEC_LIB_DEPS + ["//source/common/common:cleanup_lib"],
-)
-
-envoy_cc_library(
-    name = "codec_legacy_lib",
-    srcs = ["codec_impl_legacy.cc"],
-    hdrs = ["codec_impl_legacy.h"],
-    external_deps = ["http_parser"],
-    deps = CODEC_LIB_DEPS,
+    deps = [
+        ":codec_stats_lib",
+        ":header_formatter_lib",
+        "//include/envoy/buffer:buffer_interface",
+        "//include/envoy/http:codec_interface",
+        "//include/envoy/http:header_map_interface",
+        "//include/envoy/network:connection_interface",
+        "//source/common/buffer:buffer_lib",
+        "//source/common/buffer:watermark_buffer_lib",
+        "//source/common/common:assert_lib",
+        "//source/common/common:cleanup_lib",
+        "//source/common/common:statusor_lib",
+        "//source/common/common:utility_lib",
+        "//source/common/grpc:common_lib",
+        "//source/common/http:codec_helper_lib",
+        "//source/common/http:codes_lib",
+        "//source/common/http:exception_lib",
+        "//source/common/http:header_map_lib",
+        "//source/common/http:header_utility_lib",
+        "//source/common/http:headers_lib",
+        "//source/common/http:status_lib",
+        "//source/common/http:utility_lib",
+        "//source/common/runtime:runtime_features_lib",
+        "@envoy_api//envoy/config/core/v3:pkg_cc_proto",
+    ],
 )
 
 envoy_cc_library(