diff --git a/quic/api/QuicSocket.h b/quic/api/QuicSocket.h
index f7829b002..93d1df5df 100644
--- a/quic/api/QuicSocket.h
+++ b/quic/api/QuicSocket.h
@@ -29,6 +29,8 @@ class EventBase;
 
 namespace quic {
 
+class DSRPacketizationRequestSender;
+
 class QuicSocket {
  public:
   /**
@@ -1003,6 +1005,13 @@ class QuicSocket {
       bool eof,
       DeliveryCallback* cb = nullptr) = 0;
 
+  /**
+   * Set the DSRPacketizationRequestSender for a stream.
+   */
+  virtual WriteResult setDSRPacketizationRequestSender(
+      StreamId id,
+      std::unique_ptr<DSRPacketizationRequestSender> sender) = 0;
+
   /**
    * Register a callback to be invoked when the peer has acknowledged the
    * given offset on the given stream.
diff --git a/quic/api/QuicTransportBase.cpp b/quic/api/QuicTransportBase.cpp
index be641aede..f7526b3fd 100644
--- a/quic/api/QuicTransportBase.cpp
+++ b/quic/api/QuicTransportBase.cpp
@@ -2005,6 +2005,9 @@ QuicSocket::WriteResult QuicTransportBase::writeBufMeta(
     if (!stream->writable()) {
       return folly::makeUnexpected(LocalErrorCode::STREAM_CLOSED);
     }
+    if (!stream->dsrSender) {
+      return folly::makeUnexpected(LocalErrorCode::INVALID_OPERATION);
+    }
     if (stream->currentWriteOffset == 0 && stream->writeBuffer.empty()) {
       // If nothing has been written to writeBuffer ever, meta writing isn't
       // allowed.
@@ -3176,4 +3179,56 @@ void QuicTransportBase::onTransportKnobs(Buf knobBlob) {
                  knobBlob->length());
 }
 
+QuicSocket::WriteResult QuicTransportBase::setDSRPacketizationRequestSender(
+    StreamId id,
+    std::unique_ptr<DSRPacketizationRequestSender> sender) {
+  if (closeState_ != CloseState::OPEN) {
+    return folly::makeUnexpected(LocalErrorCode::CONNECTION_CLOSED);
+  }
+  if (isReceivingStream(conn_->nodeType, id)) {
+    return folly::makeUnexpected(LocalErrorCode::INVALID_OPERATION);
+  }
+  FOLLY_MAYBE_UNUSED auto self = sharedGuard();
+  try {
+    // Check whether stream exists before calling getStream to avoid
+    // creating a peer stream if it does not exist yet.
+    if (!conn_->streamManager->streamExists(id)) {
+      return folly::makeUnexpected(LocalErrorCode::STREAM_NOT_EXISTS);
+    }
+    auto stream = conn_->streamManager->getStream(id);
+    if (!stream->writable()) {
+      return folly::makeUnexpected(LocalErrorCode::STREAM_CLOSED);
+    }
+    if (stream->dsrSender != nullptr) {
+      return folly::makeUnexpected(LocalErrorCode::INVALID_OPERATION);
+    }
+    stream->dsrSender = std::move(sender);
+    // Fow now, no appLimited or appIdle update here since we are not writing
+    // either BufferMetas yet. The first BufferMeta write will update it.
+  } catch (const QuicTransportException& ex) {
+    VLOG(4) << __func__ << " streamId=" << id << " " << ex.what() << " "
+            << *this;
+    exceptionCloseWhat_ = ex.what();
+    closeImpl(std::make_pair(
+        QuicErrorCode(ex.errorCode()), std::string("writeChain() error")));
+    return folly::makeUnexpected(LocalErrorCode::TRANSPORT_ERROR);
+  } catch (const QuicInternalException& ex) {
+    VLOG(4) << __func__ << " streamId=" << id << " " << ex.what() << " "
+            << *this;
+    exceptionCloseWhat_ = ex.what();
+    closeImpl(std::make_pair(
+        QuicErrorCode(ex.errorCode()), std::string("writeChain() error")));
+    return folly::makeUnexpected(ex.errorCode());
+  } catch (const std::exception& ex) {
+    VLOG(4) << __func__ << " streamId=" << id << " " << ex.what() << " "
+            << *this;
+    exceptionCloseWhat_ = ex.what();
+    closeImpl(std::make_pair(
+        QuicErrorCode(TransportErrorCode::INTERNAL_ERROR),
+        std::string("writeChain() error")));
+    return folly::makeUnexpected(LocalErrorCode::INTERNAL_ERROR);
+  }
+  return folly::unit;
+}
+
 } // namespace quic
diff --git a/quic/api/QuicTransportBase.h b/quic/api/QuicTransportBase.h
index 5e8cb6ce4..1eb08adfb 100644
--- a/quic/api/QuicTransportBase.h
+++ b/quic/api/QuicTransportBase.h
@@ -178,12 +178,18 @@ class QuicTransportBase : public QuicSocket {
       bool eof,
       DeliveryCallback* cb = nullptr) override;
 
+  // TODO: Maybe I should virtualize DSR related APIs and only implement in
+  // QuicServerTransport
   WriteResult writeBufMeta(
       StreamId id,
       const BufferMeta& data,
       bool eof,
       DeliveryCallback* cb = nullptr) override;
 
+  WriteResult setDSRPacketizationRequestSender(
+      StreamId id,
+      std::unique_ptr<DSRPacketizationRequestSender> sender) override;
+
   folly::Expected<folly::Unit, LocalErrorCode> registerDeliveryCallback(
       StreamId id,
       uint64_t offset,
diff --git a/quic/api/test/MockQuicSocket.h b/quic/api/test/MockQuicSocket.h
index e5328f38e..bb42496f3 100644
--- a/quic/api/test/MockQuicSocket.h
+++ b/quic/api/test/MockQuicSocket.h
@@ -201,6 +201,16 @@ class MockQuicSocket : public QuicSocket {
   MOCK_METHOD4(
       writeBufMeta,
       WriteResult(StreamId, const BufferMeta&, bool, DeliveryCallback*));
+  MOCK_METHOD2(
+      setDSRPacketizationRequestSenderRef,
+      WriteResult(
+          StreamId,
+          const std::unique_ptr<DSRPacketizationRequestSender>&));
+  WriteResult setDSRPacketizationRequestSender(
+      StreamId streamId,
+      std::unique_ptr<DSRPacketizationRequestSender> sender) override {
+    return setDSRPacketizationRequestSenderRef(streamId, sender);
+  }
   MOCK_METHOD3(
       registerDeliveryCallback,
       folly::Expected<folly::Unit, LocalErrorCode>(
diff --git a/quic/api/test/QuicTransportTest.cpp b/quic/api/test/QuicTransportTest.cpp
index 1db2a02ea..595f0d494 100644
--- a/quic/api/test/QuicTransportTest.cpp
+++ b/quic/api/test/QuicTransportTest.cpp
@@ -19,6 +19,7 @@
 #include <quic/common/BufUtil.h>
 #include <quic/common/Timers.h>
 #include <quic/common/test/TestUtils.h>
+#include <quic/dsr/test/Mocks.h>
 #include <quic/handshake/test/Mocks.h>
 #include <quic/logging/test/Mocks.h>
 #include <quic/server/state/ServerStateMachine.h>
@@ -3409,11 +3410,13 @@ TEST_F(QuicTransportTest, PrioritySetAndGet) {
   EXPECT_EQ(LocalErrorCode::CONNECTION_CLOSED, closedConnStreamPri.error());
 }
 
-TEST_F(QuicTransportTest, WriteBufMetaIntoStream) {
+TEST_F(QuicTransportTest, SetDSRSenderAndWriteBufMetaIntoStream) {
   auto streamId = transport_->createBidirectionalStream().value();
   size_t bufferLength = 2000;
   BufferMeta meta(bufferLength);
   auto buf = buildRandomInputData(20);
+  auto dsrSender = std::make_unique<MockDSRPacketizationRequestSender>();
+  transport_->setDSRPacketizationRequestSender(streamId, std::move(dsrSender));
   // Some amount of real data needs to be written first:
   transport_->writeChain(streamId, std::move(buf), false);
   transport_->writeBufMeta(streamId, meta, true);
diff --git a/quic/dsr/CMakeLists.txt b/quic/dsr/CMakeLists.txt
new file mode 100644
index 000000000..a4923480c
--- /dev/null
+++ b/quic/dsr/CMakeLists.txt
@@ -0,0 +1,45 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+add_library(
+  mvfst_dsr_types STATIC
+  Types.cpp
+)
+
+target_include_directories(
+  mvfst_dsr_types PUBLIC
+  $<BUILD_INTERFACE:${QUIC_FBCODE_ROOT}>
+  $<INSTALL_INTERFACE:include/>
+)
+
+add_dependencies(
+  mvfst_dsr_types
+  mvfst_codec_types
+)
+
+target_libk_libraries(
+  mvfst_dsr_types PUBLIC
+  Folly::folly
+  mvfst_codec_types
+)
+
+file(
+  GLOB_RECURSE QUIC_API_HEADERS_TOINSTALL
+  RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}
+  *.h
+)
+list(FILTER QUIC_API_HEADERS_TOINSTALL EXCLUDE REGEX test/)
+foreach(header ${QUIC_API_HEADERS_TOINSTALL})
+  get_filename_component(header_dir ${header} DIRECTORY)
+  install(FILES ${header} DESTINATION include/quic/dsr/${header_dir})
+endforeach()
+
+install(
+  TARGETS mvfst_dsr_types
+  EXPORT mvfst-exports
+  DESTINATION lib
+)
+
+add_subdirectory(test)
diff --git a/quic/dsr/test/Mocks.h b/quic/dsr/test/Mocks.h
index decae09dc..1c31c642b 100644
--- a/quic/dsr/test/Mocks.h
+++ b/quic/dsr/test/Mocks.h
@@ -22,7 +22,13 @@ class MockDSRPacketBuilder : public DSRPacketBuilderBase {
     return const_cast<MockDSRPacketBuilder&>(*this).remainingSpaceNonConst();
   }
 
-  MOCK_METHOD2(addSendInstruction, void(SendInstruction, uint32_t));
+  MOCK_METHOD2(addSendInstructionPtr, void(const SendInstruction*, uint32_t));
+
+  void addSendInstruction(
+      SendInstruction instruction,
+      uint32_t streamEncodedSize) override {
+    addSendInstructionPtr(&instruction, streamEncodedSize);
+  }
 };
 
 class MockDSRPacketizationRequestSender : public DSRPacketizationRequestSender {
diff --git a/quic/dsr/test/SchedulerTest.cpp b/quic/dsr/test/SchedulerTest.cpp
index 3981ef59a..90a92e6a6 100644
--- a/quic/dsr/test/SchedulerTest.cpp
+++ b/quic/dsr/test/SchedulerTest.cpp
@@ -53,12 +53,12 @@ TEST_F(SchedulerTest, ScheduleStream) {
       conn_.streamManager->hasDSRWritable());
   EXPECT_TRUE(scheduler.hasPendingData());
   EXPECT_CALL(builder_, remainingSpaceNonConst()).WillRepeatedly(Return(1000));
-  EXPECT_CALL(builder_, addSendInstruction(_, _))
-      .WillOnce(Invoke([&](SendInstruction instruction, uint32_t) {
-        EXPECT_EQ(stream->id, (size_t)instruction.streamId);
-        EXPECT_EQ(expectedBufMetaOffset, instruction.offset);
-        EXPECT_EQ(200, instruction.len);
-        EXPECT_TRUE(instruction.fin);
+  EXPECT_CALL(builder_, addSendInstructionPtr(_, _))
+      .WillOnce(Invoke([&](const SendInstruction* instruction, uint32_t) {
+        EXPECT_EQ(stream->id, (size_t)instruction->streamId);
+        EXPECT_EQ(expectedBufMetaOffset, instruction->offset);
+        EXPECT_EQ(200, instruction->len);
+        EXPECT_TRUE(instruction->fin);
       }));
   EXPECT_TRUE(scheduler.writeStream(builder_));
 
diff --git a/quic/state/StreamData.h b/quic/state/StreamData.h
index 5cc40b3f3..e1e9b6f59 100644
--- a/quic/state/StreamData.h
+++ b/quic/state/StreamData.h
@@ -12,6 +12,7 @@
 #include <quic/QuicConstants.h>
 #include <quic/codec/Types.h>
 #include <quic/common/SmallVec.h>
+#include <quic/dsr/DSRPacketizationRequestSender.h>
 #include <quic/state/QuicPriorityQueue.h>
 
 namespace quic {
@@ -354,5 +355,7 @@ struct QuicStreamState : public QuicStreamLike {
   bool hasPeekableData() const {
     return readBuffer.size() > 0;
   }
+
+  std::unique_ptr<DSRPacketizationRequestSender> dsrSender;
 };
 } // namespace quic