diff --git a/BUILD b/BUILD
index 82971541..613bcf06 100644
--- a/BUILD
+++ b/BUILD
@@ -83,6 +83,7 @@ proto_library(
         "//contrib/envoy/extensions/filters/network/client_ssl_auth/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/action/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/codecs/dubbo/v3:pkg",
+        "//contrib/envoy/extensions/filters/network/generic_proxy/codecs/http1/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/codecs/kafka/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/matcher/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/router/v3:pkg",
diff --git a/contrib/envoy/extensions/filters/network/generic_proxy/codecs/http1/v3/BUILD b/contrib/envoy/extensions/filters/network/generic_proxy/codecs/http1/v3/BUILD
new file mode 100644
index 00000000..d49202b7
--- /dev/null
+++ b/contrib/envoy/extensions/filters/network/generic_proxy/codecs/http1/v3/BUILD
@@ -0,0 +1,12 @@
+# DO NOT EDIT. This file is generated by tools/proto_format/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = [
+        "@com_github_cncf_xds//udpa/annotations:pkg",
+        "@com_github_cncf_xds//xds/annotations/v3:pkg",
+    ],
+)
diff --git a/contrib/envoy/extensions/filters/network/generic_proxy/codecs/http1/v3/http1.proto b/contrib/envoy/extensions/filters/network/generic_proxy/codecs/http1/v3/http1.proto
new file mode 100644
index 00000000..973a190d
--- /dev/null
+++ b/contrib/envoy/extensions/filters/network/generic_proxy/codecs/http1/v3/http1.proto
@@ -0,0 +1,49 @@
+syntax = "proto3";
+
+package envoy.extensions.filters.network.generic_proxy.codecs.http1.v3;
+
+import "google/protobuf/wrappers.proto";
+
+import "xds/annotations/v3/status.proto";
+
+import "udpa/annotations/status.proto";
+
+option java_package = "io.envoyproxy.envoy.extensions.filters.network.generic_proxy.codecs.http1.v3";
+option java_outer_classname = "Http1Proto";
+option java_multiple_files = true;
+option go_package = "github.com/envoyproxy/go-control-plane/contrib/envoy/extensions/filters/network/generic_proxy/codecs/http1/v3;http1v3";
+option (udpa.annotations.file_status).package_version_status = ACTIVE;
+option (xds.annotations.v3.file_status).work_in_progress = true;
+
+// [#protodoc-title: HTTP1 codec configuration for Generic Proxy]
+// [#extension: envoy.generic_proxy.codecs.http1]
+
+// Configuration for HTTP codec. This HTTP1 codec is used to parse and serialize HTTP1 messages
+// for the generic proxy filter.
+// Any decoding error will result in the generic proxy closing the connection.
+//
+// .. note::
+//   This codec only supports HTTP1.1 messages and does not support HTTP1.0 messages. And it limits
+//   part of the HTTP1.1 features, such as upgrade, connect, etc.
+//   This codec is mainly designed for the features evaluation of the generic proxy filter. Please
+//   be cautious when using it in production.
+message Http1CodecConfig {
+  // If true, the codec will parse and serialize HTTP1 messages in a single frame per message.
+  //
+  // A frame is a minimal unit of data that can be processed by the generic proxy. If false, the
+  // codec will parse and serialize HTTP1 messages in a streaming way. In this case, the codec
+  // will output multiple frames for a single HTTP1 message to the generic proxy.
+  // If true, the codec will buffer the entire HTTP1 message body before sending it to the generic
+  // proxy. This may have better performance in small message scenarios and is more friendly to
+  // handle the HTTP1 message body. This also may result in higher memory usage and latency if
+  // the message body is large.
+  //
+  // Default is true.
+  google.protobuf.BoolValue single_frame_mode = 1;
+
+  // The maximum size of the HTTP1 message body in bytes. If not set, 8*1024*1024 (8MB) is used.
+  // This only makes sense when single_frame_mode is true.
+  // If the HTTP1 message body size exceeds this value, this will result in a decoding error
+  // and the generic proxy will close the connection.
+  google.protobuf.UInt32Value max_buffer_size = 2;
+}
diff --git a/versioning/BUILD b/versioning/BUILD
index b74e3df2..56952b6f 100644
--- a/versioning/BUILD
+++ b/versioning/BUILD
@@ -21,6 +21,7 @@ proto_library(
         "//contrib/envoy/extensions/filters/network/client_ssl_auth/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/action/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/codecs/dubbo/v3:pkg",
+        "//contrib/envoy/extensions/filters/network/generic_proxy/codecs/http1/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/codecs/kafka/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/matcher/v3:pkg",
         "//contrib/envoy/extensions/filters/network/generic_proxy/router/v3:pkg",