diff --git a/http2/adapter/nghttp2_adapter_test.cc b/http2/adapter/nghttp2_adapter_test.cc
index 206d8e2..ff92a65 100644
--- a/http2/adapter/nghttp2_adapter_test.cc
+++ b/http2/adapter/nghttp2_adapter_test.cc
@@ -390,6 +390,60 @@
                                             spdy::SpdyFrameType::RST_STREAM}));
 }
 
+TEST(NgHttp2AdapterTest, ClientHandles304WithContentLength) {
+  DataSavingVisitor visitor;
+  auto adapter = NgHttp2Adapter::CreateClientAdapter(visitor);
+
+  testing::InSequence s;
+
+  const std::vector<Header> headers =
+      ToHeaders({{":method", "GET"},
+                 {":scheme", "http"},
+                 {":authority", "example.com"},
+                 {":path", "/this/is/request/one"}});
+
+  const int32_t stream_id = adapter->SubmitRequest(headers, nullptr, nullptr);
+  ASSERT_GT(stream_id, 0);
+
+  EXPECT_CALL(visitor, OnBeforeFrameSent(HEADERS, stream_id, _, 0x5));
+  EXPECT_CALL(visitor, OnFrameSent(HEADERS, stream_id, _, 0x5, 0));
+
+  int result = adapter->Send();
+  EXPECT_EQ(0, result);
+  visitor.Clear();
+
+  const std::string stream_frames =
+      TestFrameSequence()
+          .ServerPreface()
+          .Headers(1, {{":status", "304"}, {"content-length", "2"}},
+                   /*fin=*/true)
+          .Serialize();
+
+  // Server preface (empty SETTINGS)
+  EXPECT_CALL(visitor, OnFrameHeader(0, 0, SETTINGS, 0));
+  EXPECT_CALL(visitor, OnSettingsStart());
+  EXPECT_CALL(visitor, OnSettingsEnd());
+
+  EXPECT_CALL(visitor, OnFrameHeader(1, _, HEADERS, 5));
+  EXPECT_CALL(visitor, OnBeginHeadersForStream(1));
+  EXPECT_CALL(visitor, OnHeaderForStream(1, ":status", "304"));
+  EXPECT_CALL(visitor, OnHeaderForStream(1, "content-length", "2"));
+  EXPECT_CALL(visitor, OnEndHeadersForStream(1));
+  EXPECT_CALL(visitor, OnEndStream(1));
+  EXPECT_CALL(visitor, OnCloseStream(1, Http2ErrorCode::HTTP2_NO_ERROR));
+
+  const int64_t stream_result = adapter->ProcessBytes(stream_frames);
+  EXPECT_EQ(stream_frames.size(), static_cast<size_t>(stream_result));
+
+  EXPECT_CALL(visitor, OnBeforeFrameSent(SETTINGS, 0, _, 0x1));
+  EXPECT_CALL(visitor, OnFrameSent(SETTINGS, 0, _, 0x1, 0));
+
+  EXPECT_TRUE(adapter->want_write());
+  result = adapter->Send();
+  EXPECT_EQ(0, result);
+  EXPECT_THAT(visitor.data(), EqualsFrames({spdy::SpdyFrameType::SETTINGS}));
+}
+
 TEST(NgHttp2AdapterTest, ClientHandlesTrailers) {
   DataSavingVisitor visitor;
   auto adapter = NgHttp2Adapter::CreateClientAdapter(visitor);
diff --git a/http2/adapter/oghttp2_adapter_test.cc b/http2/adapter/oghttp2_adapter_test.cc
index d3f235d..ee67139 100644
--- a/http2/adapter/oghttp2_adapter_test.cc
+++ b/http2/adapter/oghttp2_adapter_test.cc
@@ -469,6 +469,63 @@
                                             spdy::SpdyFrameType::RST_STREAM}));
 }
 
+TEST(OgHttp2AdapterClientTest, ClientHandles304WithContentLength) {
+  DataSavingVisitor visitor;
+  OgHttp2Adapter::Options options{.perspective = Perspective::kClient};
+  auto adapter = OgHttp2Adapter::Create(visitor, options);
+
+  testing::InSequence s;
+
+  const std::vector<Header> headers =
+      ToHeaders({{":method", "GET"},
+                 {":scheme", "http"},
+                 {":authority", "example.com"},
+                 {":path", "/this/is/request/one"}});
+
+  const int32_t stream_id = adapter->SubmitRequest(headers, nullptr, nullptr);
+  ASSERT_GT(stream_id, 0);
+
+  EXPECT_CALL(visitor, OnBeforeFrameSent(SETTINGS, 0, _, 0x0));
+  EXPECT_CALL(visitor, OnFrameSent(SETTINGS, 0, _, 0x0, 0));
+  EXPECT_CALL(visitor, OnBeforeFrameSent(HEADERS, stream_id, _, 0x5));
+  EXPECT_CALL(visitor, OnFrameSent(HEADERS, stream_id, _, 0x5, 0));
+
+  int result = adapter->Send();
+  EXPECT_EQ(0, result);
+  visitor.Clear();
+
+  const std::string stream_frames =
+      TestFrameSequence()
+          .ServerPreface()
+          .Headers(1, {{":status", "304"}, {"content-length", "2"}},
+                   /*fin=*/true)
+          .Serialize();
+
+  // Server preface (empty SETTINGS)
+  EXPECT_CALL(visitor, OnFrameHeader(0, 0, SETTINGS, 0));
+  EXPECT_CALL(visitor, OnSettingsStart());
+  EXPECT_CALL(visitor, OnSettingsEnd());
+
+  EXPECT_CALL(visitor, OnFrameHeader(1, _, HEADERS, 5));
+  EXPECT_CALL(visitor, OnBeginHeadersForStream(1));
+  EXPECT_CALL(visitor, OnHeaderForStream(1, ":status", "304"));
+  EXPECT_CALL(visitor, OnHeaderForStream(1, "content-length", "2"));
+  EXPECT_CALL(visitor, OnEndHeadersForStream(1));
+  EXPECT_CALL(visitor, OnEndStream(1));
+  EXPECT_CALL(visitor, OnCloseStream(1, Http2ErrorCode::HTTP2_NO_ERROR));
+
+  const int64_t stream_result = adapter->ProcessBytes(stream_frames);
+  EXPECT_EQ(stream_frames.size(), static_cast<size_t>(stream_result));
+
+  EXPECT_CALL(visitor, OnBeforeFrameSent(SETTINGS, 0, _, 0x1));
+  EXPECT_CALL(visitor, OnFrameSent(SETTINGS, 0, _, 0x1, 0));
+
+  EXPECT_TRUE(adapter->want_write());
+  result = adapter->Send();
+  EXPECT_EQ(0, result);
+  EXPECT_THAT(visitor.data(), EqualsFrames({spdy::SpdyFrameType::SETTINGS}));
+}
+
 TEST(OgHttp2AdapterClientTest, ClientHandlesTrailers) {
   DataSavingVisitor visitor;
   OgHttp2Adapter::Options options{.perspective = Perspective::kClient};
diff --git a/http2/adapter/oghttp2_session.cc b/http2/adapter/oghttp2_session.cc
index 4c14b1b..547ea15 100644
--- a/http2/adapter/oghttp2_session.cc
+++ b/http2/adapter/oghttp2_session.cc
@@ -1119,7 +1119,10 @@
       it->second.received_header_type = headers_handler_.header_type();
     }
     if (headers_handler_.header_type() == HeaderType::REQUEST ||
-        headers_handler_.header_type() == HeaderType::RESPONSE) {
+        (headers_handler_.header_type() == HeaderType::RESPONSE &&
+         headers_handler_.status_header() != "304")) {
+      // 304 response content-length values should be ignored:
+      // https://httpwg.org/specs/rfc7230.html#rfc.section.3.3.2
       it->second.remaining_content_length = headers_handler_.content_length();
     }
     headers_handler_.set_stream_id(0);