diff --git a/quiche/http2/hpack/decoder/hpack_decoder.cc b/quiche/http2/hpack/decoder/hpack_decoder.cc
index 935cd7f..310e8a7 100644
--- a/quiche/http2/hpack/decoder/hpack_decoder.cc
+++ b/quiche/http2/hpack/decoder/hpack_decoder.cc
@@ -54,7 +54,7 @@
   // which finally forwards them to the HpackDecoderListener.
   DecodeStatus status = block_decoder_.Decode(db);
   if (status == DecodeStatus::kDecodeError) {
-    ReportError(block_decoder_.error(), "");
+    ReportError(block_decoder_.error());
     QUICHE_CODE_COUNT_N(decompress_failure_3, 4, 23);
     return false;
   } else if (DetectError()) {
@@ -80,7 +80,7 @@
   }
   if (!block_decoder_.before_entry()) {
     // The HPACK block ended in the middle of an entry.
-    ReportError(HpackDecodingError::kTruncatedBlock, "");
+    ReportError(HpackDecodingError::kTruncatedBlock);
     QUICHE_CODE_COUNT_N(decompress_failure_3, 7, 23);
     return false;
   }
@@ -102,20 +102,17 @@
     QUICHE_DVLOG(2) << "Error detected in decoder_state_";
     QUICHE_CODE_COUNT_N(decompress_failure_3, 10, 23);
     error_ = decoder_state_.error();
-    detailed_error_ = decoder_state_.detailed_error();
   }
 
   return error_ != HpackDecodingError::kOk;
 }
 
-void HpackDecoder::ReportError(HpackDecodingError error,
-                               std::string detailed_error) {
+void HpackDecoder::ReportError(HpackDecodingError error) {
   QUICHE_DVLOG(3) << "HpackDecoder::ReportError is new="
                   << (error_ == HpackDecodingError::kOk ? "true" : "false")
                   << ", error: " << HpackDecodingErrorToString(error);
   if (error_ == HpackDecodingError::kOk) {
     error_ = error;
-    detailed_error_ = detailed_error;
     decoder_state_.listener()->OnHeaderErrorDetected(
         HpackDecodingErrorToString(error));
   }
diff --git a/quiche/http2/hpack/decoder/hpack_decoder.h b/quiche/http2/hpack/decoder/hpack_decoder.h
index 9e4b68b..d231f85 100644
--- a/quiche/http2/hpack/decoder/hpack_decoder.h
+++ b/quiche/http2/hpack/decoder/hpack_decoder.h
@@ -104,13 +104,11 @@
   // Error code if an error has occurred, HpackDecodingError::kOk otherwise.
   HpackDecodingError error() const { return error_; }
 
-  std::string detailed_error() const { return detailed_error_; }
-
  private:
   friend class test::HpackDecoderPeer;
 
   // Reports an error to the listener IF this is the first error detected.
-  void ReportError(HpackDecodingError error, std::string detailed_error);
+  void ReportError(HpackDecodingError error);
 
   // The decompressor state, as defined by HPACK (i.e. the static and dynamic
   // tables).
@@ -124,7 +122,6 @@
 
   // Error code if an error has occurred, HpackDecodingError::kOk otherwise.
   HpackDecodingError error_;
-  std::string detailed_error_;
 };
 
 }  // namespace http2
diff --git a/quiche/http2/hpack/decoder/hpack_decoder_state.cc b/quiche/http2/hpack/decoder/hpack_decoder_state.cc
index e34be72..459a475 100644
--- a/quiche/http2/hpack/decoder/hpack_decoder_state.cc
+++ b/quiche/http2/hpack/decoder/hpack_decoder_state.cc
@@ -83,7 +83,7 @@
     return;
   }
   if (require_dynamic_table_size_update_) {
-    ReportError(HpackDecodingError::kMissingDynamicTableSizeUpdate, "");
+    ReportError(HpackDecodingError::kMissingDynamicTableSizeUpdate);
     return;
   }
   allow_dynamic_table_size_update_ = false;
@@ -91,7 +91,7 @@
   if (entry != nullptr) {
     listener_->OnHeader(entry->name, entry->value);
   } else {
-    ReportError(HpackDecodingError::kInvalidIndex, "");
+    ReportError(HpackDecodingError::kInvalidIndex);
   }
 }
 
@@ -105,7 +105,7 @@
     return;
   }
   if (require_dynamic_table_size_update_) {
-    ReportError(HpackDecodingError::kMissingDynamicTableSizeUpdate, "");
+    ReportError(HpackDecodingError::kMissingDynamicTableSizeUpdate);
     return;
   }
   allow_dynamic_table_size_update_ = false;
@@ -117,7 +117,7 @@
       decoder_tables_.Insert(entry->name, std::move(value));
     }
   } else {
-    ReportError(HpackDecodingError::kInvalidNameIndex, "");
+    ReportError(HpackDecodingError::kInvalidNameIndex);
   }
 }
 
@@ -130,7 +130,7 @@
     return;
   }
   if (require_dynamic_table_size_update_) {
-    ReportError(HpackDecodingError::kMissingDynamicTableSizeUpdate, "");
+    ReportError(HpackDecodingError::kMissingDynamicTableSizeUpdate);
     return;
   }
   allow_dynamic_table_size_update_ = false;
@@ -155,15 +155,14 @@
   if (!allow_dynamic_table_size_update_) {
     // At most two dynamic table size updates allowed at the start, and not
     // after a header.
-    ReportError(HpackDecodingError::kDynamicTableSizeUpdateNotAllowed, "");
+    ReportError(HpackDecodingError::kDynamicTableSizeUpdateNotAllowed);
     return;
   }
   if (require_dynamic_table_size_update_) {
     // The new size must not be greater than the low water mark.
     if (size_limit > lowest_header_table_size_) {
-      ReportError(
-          HpackDecodingError::kInitialDynamicTableSizeUpdateIsAboveLowWaterMark,
-          "");
+      ReportError(HpackDecodingError::
+                      kInitialDynamicTableSizeUpdateIsAboveLowWaterMark);
       return;
     }
     require_dynamic_table_size_update_ = false;
@@ -171,8 +170,7 @@
     // The new size must not be greater than the final max header table size
     // that the peer acknowledged.
     ReportError(
-        HpackDecodingError::kDynamicTableSizeUpdateIsAboveAcknowledgedSetting,
-        "");
+        HpackDecodingError::kDynamicTableSizeUpdateIsAboveAcknowledgedSetting);
     return;
   }
   decoder_tables_.DynamicTableSizeUpdate(size_limit);
@@ -185,12 +183,11 @@
   lowest_header_table_size_ = final_header_table_size_;
 }
 
-void HpackDecoderState::OnHpackDecodeError(HpackDecodingError error,
-                                           std::string detailed_error) {
+void HpackDecoderState::OnHpackDecodeError(HpackDecodingError error) {
   QUICHE_DVLOG(2) << "HpackDecoderState::OnHpackDecodeError "
                   << HpackDecodingErrorToString(error);
   if (error_ == HpackDecodingError::kOk) {
-    ReportError(error, detailed_error);
+    ReportError(error);
   }
 }
 
@@ -202,21 +199,19 @@
   if (require_dynamic_table_size_update_) {
     // Apparently the HPACK block was empty, but we needed it to contain at
     // least 1 dynamic table size update.
-    ReportError(HpackDecodingError::kMissingDynamicTableSizeUpdate, "");
+    ReportError(HpackDecodingError::kMissingDynamicTableSizeUpdate);
   } else {
     listener_->OnHeaderListEnd();
   }
 }
 
-void HpackDecoderState::ReportError(HpackDecodingError error,
-                                    std::string detailed_error) {
+void HpackDecoderState::ReportError(HpackDecodingError error) {
   QUICHE_DVLOG(2) << "HpackDecoderState::ReportError is new="
                   << (error_ == HpackDecodingError::kOk ? "true" : "false")
                   << ", error: " << HpackDecodingErrorToString(error);
   if (error_ == HpackDecodingError::kOk) {
     listener_->OnHeaderErrorDetected(HpackDecodingErrorToString(error));
     error_ = error;
-    detailed_error_ = detailed_error;
   }
 }
 
diff --git a/quiche/http2/hpack/decoder/hpack_decoder_state.h b/quiche/http2/hpack/decoder/hpack_decoder_state.h
index 4198ef4..32b5c2b 100644
--- a/quiche/http2/hpack/decoder/hpack_decoder_state.h
+++ b/quiche/http2/hpack/decoder/hpack_decoder_state.h
@@ -76,8 +76,7 @@
                              HpackDecoderStringBuffer* name_buffer,
                              HpackDecoderStringBuffer* value_buffer) override;
   void OnDynamicTableSizeUpdate(size_t size) override;
-  void OnHpackDecodeError(HpackDecodingError error,
-                          std::string detailed_error) override;
+  void OnHpackDecodeError(HpackDecodingError error) override;
 
   // OnHeaderBlockEnd notifies this object that an entire HPACK block has been
   // decoded, which might have extended into CONTINUATION blocks.
@@ -95,13 +94,11 @@
     return decoder_tables_;
   }
 
-  std::string detailed_error() const { return detailed_error_; }
-
  private:
   friend class test::HpackDecoderStatePeer;
 
   // Reports an error to the listener IF this is the first error detected.
-  void ReportError(HpackDecodingError error, std::string detailed_error);
+  void ReportError(HpackDecodingError error);
 
   // The static and dynamic HPACK tables.
   HpackDecoderTables decoder_tables_;
@@ -129,7 +126,6 @@
 
   // Has an error already been detected and reported to the listener?
   HpackDecodingError error_;
-  std::string detailed_error_;
 };
 
 }  // namespace http2
diff --git a/quiche/http2/hpack/decoder/hpack_decoder_state_test.cc b/quiche/http2/hpack/decoder/hpack_decoder_state_test.cc
index a5354e7..12df0be 100644
--- a/quiche/http2/hpack/decoder/hpack_decoder_state_test.cc
+++ b/quiche/http2/hpack/decoder/hpack_decoder_state_test.cc
@@ -448,7 +448,7 @@
   decoder_state_.OnLiteralNameAndValue(HpackEntryType::kIndexedLiteralHeader,
                                        &name_buffer_, &value_buffer_);
   decoder_state_.OnHeaderBlockEnd();
-  decoder_state_.OnHpackDecodeError(HpackDecodingError::kIndexVarintError, "");
+  decoder_state_.OnHpackDecodeError(HpackDecodingError::kIndexVarintError);
 }
 
 // Confirm that required size updates are validated.
@@ -517,7 +517,7 @@
   SendStartAndVerifyCallback();
   EXPECT_CALL(listener_,
               OnHeaderErrorDetected(Eq("Name Huffman encoding error")));
-  decoder_state_.OnHpackDecodeError(HpackDecodingError::kNameHuffmanError, "");
+  decoder_state_.OnHpackDecodeError(HpackDecodingError::kNameHuffmanError);
 
   // Further decoded entries are ignored.
   decoder_state_.OnIndexedHeader(1);
@@ -529,7 +529,7 @@
   decoder_state_.OnLiteralNameAndValue(HpackEntryType::kIndexedLiteralHeader,
                                        &name_buffer_, &value_buffer_);
   decoder_state_.OnHeaderBlockEnd();
-  decoder_state_.OnHpackDecodeError(HpackDecodingError::kIndexVarintError, "");
+  decoder_state_.OnHpackDecodeError(HpackDecodingError::kIndexVarintError);
 }
 
 }  // namespace
diff --git a/quiche/http2/hpack/decoder/hpack_whole_entry_buffer.cc b/quiche/http2/hpack/decoder/hpack_whole_entry_buffer.cc
index ab6128e..04c8aad 100644
--- a/quiche/http2/hpack/decoder/hpack_whole_entry_buffer.cc
+++ b/quiche/http2/hpack/decoder/hpack_whole_entry_buffer.cc
@@ -144,7 +144,7 @@
     QUICHE_DVLOG(1) << "HpackWholeEntryBuffer::ReportError: "
                     << HpackDecodingErrorToString(error);
     error_detected_ = true;
-    listener_->OnHpackDecodeError(error, "");
+    listener_->OnHpackDecodeError(error);
     listener_ = HpackWholeEntryNoOpListener::NoOpListener();
   }
 }
diff --git a/quiche/http2/hpack/decoder/hpack_whole_entry_buffer_test.cc b/quiche/http2/hpack/decoder/hpack_whole_entry_buffer_test.cc
index 03ad77c..b1d3907 100644
--- a/quiche/http2/hpack/decoder/hpack_whole_entry_buffer_test.cc
+++ b/quiche/http2/hpack/decoder/hpack_whole_entry_buffer_test.cc
@@ -35,9 +35,7 @@
                HpackDecoderStringBuffer* value_buffer),
               (override));
   MOCK_METHOD(void, OnDynamicTableSizeUpdate, (size_t size), (override));
-  MOCK_METHOD(void, OnHpackDecodeError,
-              (HpackDecodingError error, std::string detailed_error),
-              (override));
+  MOCK_METHOD(void, OnHpackDecodeError, (HpackDecodingError error), (override));
 };
 
 class HpackWholeEntryBufferTest : public quiche::test::QuicheTest {
@@ -155,16 +153,14 @@
 // Verify that a name longer than the allowed size generates an error.
 TEST_F(HpackWholeEntryBufferTest, NameTooLong) {
   entry_buffer_.OnStartLiteralHeader(HpackEntryType::kIndexedLiteralHeader, 0);
-  EXPECT_CALL(listener_,
-              OnHpackDecodeError(HpackDecodingError::kNameTooLong, _));
+  EXPECT_CALL(listener_, OnHpackDecodeError(HpackDecodingError::kNameTooLong));
   entry_buffer_.OnNameStart(false, kMaxStringSize + 1);
 }
 
 // Verify that a value longer than the allowed size generates an error.
 TEST_F(HpackWholeEntryBufferTest, ValueTooLong) {
   entry_buffer_.OnStartLiteralHeader(HpackEntryType::kIndexedLiteralHeader, 0);
-  EXPECT_CALL(listener_,
-              OnHpackDecodeError(HpackDecodingError::kValueTooLong, ""));
+  EXPECT_CALL(listener_, OnHpackDecodeError(HpackDecodingError::kValueTooLong));
   entry_buffer_.OnNameStart(false, 4);
   entry_buffer_.OnNameData("path", 4);
   entry_buffer_.OnNameEnd();
@@ -174,8 +170,7 @@
 // Regression test for b/162141899.
 TEST_F(HpackWholeEntryBufferTest, ValueTooLongWithoutName) {
   entry_buffer_.OnStartLiteralHeader(HpackEntryType::kIndexedLiteralHeader, 1);
-  EXPECT_CALL(listener_,
-              OnHpackDecodeError(HpackDecodingError::kValueTooLong, ""));
+  EXPECT_CALL(listener_, OnHpackDecodeError(HpackDecodingError::kValueTooLong));
   entry_buffer_.OnValueStart(false, kMaxStringSize + 1);
 }
 
@@ -189,7 +184,7 @@
   entry_buffer_.OnNameData(data, 3);
 
   EXPECT_CALL(listener_,
-              OnHpackDecodeError(HpackDecodingError::kNameHuffmanError, _));
+              OnHpackDecodeError(HpackDecodingError::kNameHuffmanError));
 
   entry_buffer_.OnNameData(data, 1);
 
@@ -208,7 +203,7 @@
   entry_buffer_.OnValueData(data, 3);
 
   EXPECT_CALL(listener_,
-              OnHpackDecodeError(HpackDecodingError::kValueHuffmanError, _));
+              OnHpackDecodeError(HpackDecodingError::kValueHuffmanError));
 
   entry_buffer_.OnValueEnd();
 
diff --git a/quiche/http2/hpack/decoder/hpack_whole_entry_listener.cc b/quiche/http2/hpack/decoder/hpack_whole_entry_listener.cc
index d6fe82b..ee2dc91 100644
--- a/quiche/http2/hpack/decoder/hpack_whole_entry_listener.cc
+++ b/quiche/http2/hpack/decoder/hpack_whole_entry_listener.cc
@@ -19,7 +19,7 @@
     HpackDecoderStringBuffer* /*value_buffer*/) {}
 void HpackWholeEntryNoOpListener::OnDynamicTableSizeUpdate(size_t /*size*/) {}
 void HpackWholeEntryNoOpListener::OnHpackDecodeError(
-    HpackDecodingError /*error*/, std::string /*detailed_error*/) {}
+    HpackDecodingError /*error*/) {}
 
 // static
 HpackWholeEntryNoOpListener* HpackWholeEntryNoOpListener::NoOpListener() {
diff --git a/quiche/http2/hpack/decoder/hpack_whole_entry_listener.h b/quiche/http2/hpack/decoder/hpack_whole_entry_listener.h
index 54e4506..12e10fe 100644
--- a/quiche/http2/hpack/decoder/hpack_whole_entry_listener.h
+++ b/quiche/http2/hpack/decoder/hpack_whole_entry_listener.h
@@ -49,8 +49,7 @@
   virtual void OnDynamicTableSizeUpdate(size_t size) = 0;
 
   // OnHpackDecodeError is called if an error is detected while decoding.
-  virtual void OnHpackDecodeError(HpackDecodingError error,
-                                  std::string detailed_error) = 0;
+  virtual void OnHpackDecodeError(HpackDecodingError error) = 0;
 };
 
 // A no-op implementation of HpackWholeEntryDecoderListener, useful for ignoring
@@ -68,8 +67,7 @@
                              HpackDecoderStringBuffer* name_buffer,
                              HpackDecoderStringBuffer* value_buffer) override;
   void OnDynamicTableSizeUpdate(size_t size) override;
-  void OnHpackDecodeError(HpackDecodingError error,
-                          std::string detailed_error) override;
+  void OnHpackDecodeError(HpackDecodingError error) override;
 
   // Returns a listener that ignores all the calls.
   static HpackWholeEntryNoOpListener* NoOpListener();
diff --git a/quiche/spdy/core/hpack/hpack_decoder_adapter.cc b/quiche/spdy/core/hpack/hpack_decoder_adapter.cc
index 6e7d2c5..b982778 100644
--- a/quiche/spdy/core/hpack/hpack_decoder_adapter.cc
+++ b/quiche/spdy/core/hpack/hpack_decoder_adapter.cc
@@ -55,7 +55,6 @@
     if (!hpack_decoder_.StartDecodingBlock()) {
       header_block_started_ = false;
       error_ = hpack_decoder_.error();
-      detailed_error_ = hpack_decoder_.detailed_error();
       return false;
     }
   }
@@ -70,14 +69,12 @@
                       << max_decode_buffer_size_bytes_ << " < "
                       << headers_data_length;
       error_ = http2::HpackDecodingError::kFragmentTooLong;
-      detailed_error_ = "";
       return false;
     }
     listener_adapter_.AddToTotalHpackBytes(headers_data_length);
     if (max_header_block_bytes_ != 0 &&
         listener_adapter_.total_hpack_bytes() > max_header_block_bytes_) {
       error_ = http2::HpackDecodingError::kCompressedHeaderSizeExceedsLimit;
-      detailed_error_ = "";
       return false;
     }
     http2::DecodeBuffer db(headers_data, headers_data_length);
@@ -85,7 +82,6 @@
     QUICHE_DCHECK(!ok || db.Empty()) << "Remaining=" << db.Remaining();
     if (!ok) {
       error_ = hpack_decoder_.error();
-      detailed_error_ = hpack_decoder_.detailed_error();
     }
     return ok;
   }
@@ -97,7 +93,6 @@
   if (!hpack_decoder_.EndDecodingBlock()) {
     QUICHE_DVLOG(3) << "EndDecodingBlock returned false";
     error_ = hpack_decoder_.error();
-    detailed_error_ = hpack_decoder_.detailed_error();
     return false;
   }
   header_block_started_ = false;
diff --git a/quiche/spdy/core/hpack/hpack_decoder_adapter.h b/quiche/spdy/core/hpack/hpack_decoder_adapter.h
index ce3220e..d3d3dec 100644
--- a/quiche/spdy/core/hpack/hpack_decoder_adapter.h
+++ b/quiche/spdy/core/hpack/hpack_decoder_adapter.h
@@ -80,8 +80,6 @@
   // Error code if an error has occurred, Error::kOk otherwise.
   http2::HpackDecodingError error() const { return error_; }
 
-  std::string detailed_error() const { return detailed_error_; }
-
  private:
   class QUICHE_EXPORT ListenerAdapter : public http2::HpackDecoderListener {
    public:
@@ -137,7 +135,6 @@
 
   // Error code if an error has occurred, Error::kOk otherwise.
   http2::HpackDecodingError error_;
-  std::string detailed_error_;
 };
 
 }  // namespace spdy
diff --git a/quiche/spdy/core/http2_frame_decoder_adapter.cc b/quiche/spdy/core/http2_frame_decoder_adapter.cc
index 58cf162..3896ebd 100644
--- a/quiche/spdy/core/http2_frame_decoder_adapter.cc
+++ b/quiche/spdy/core/http2_frame_decoder_adapter.cc
@@ -475,7 +475,7 @@
   auto& decoder = GetHpackDecoder();
   if (!decoder.HandleControlFrameHeadersData(data, len)) {
     SetSpdyErrorAndNotify(HpackDecodingErrorToSpdyFramerError(decoder.error()),
-                          decoder.detailed_error());
+                          "");
     return;
   }
 }