Segmentation fault on HEAD HTTP query #912

dbms/src/IO/WriteBufferFromHTTPServerResponse.cpp

@@ -30,7 +30,8 @@ void WriteBufferFromHTTPServerResponse::startSendHeaders()
         setResponseDefaultHeaders(response);
 
 #if POCO_CLICKHOUSE_PATCH
-        std::tie(response_header_ostr, response_body_ostr) = response.beginSend();
+        if (request.getMethod() != Poco::Net::HTTPRequest::HTTP_HEAD)
+            std::tie(response_header_ostr, response_body_ostr) = response.beginSend();
 #endif
     }
 }
@@ -42,16 +43,21 @@ void WriteBufferFromHTTPServerResponse::finishSendHeaders()
     {
         headers_finished_sending = true;
 
+        if (request.getMethod() != Poco::Net::HTTPRequest::HTTP_HEAD) {
 #if POCO_CLICKHOUSE_PATCH
-        /// Send end of headers delimiter.
-        if (response_header_ostr)
-            *response_header_ostr << "\r\n" << std::flush;
+            /// Send end of headers delimiter.
+            if (response_header_ostr)
+                *response_header_ostr << "\r\n" << std::flush;
 #else
-        /// Newline autosent by response.send()
-        /// if nothing to send in body:
-        if (!response_body_ostr)
-            response_body_ostr = &(response.send());
+            /// Newline autosent by response.send()
+            /// if nothing to send in body:
+            if (!response_body_ostr)
+                response_body_ostr = &(response.send());
 #endif
+        } else {
+            if (!response_body_ostr)
+                response_body_ostr = &(response.send());
+        }
     }
 }
 
@@ -63,7 +69,7 @@ void WriteBufferFromHTTPServerResponse::nextImpl()
 
         startSendHeaders();
 
-        if (!out)
+        if (!out && request.getMethod() != Poco::Net::HTTPRequest::HTTP_HEAD)
         {
             if (compress)
             {
@@ -111,17 +117,20 @@ void WriteBufferFromHTTPServerResponse::nextImpl()
 
     }
 
-    out->position() = position();
-    out->next();
+    if (out) {
+        out->position() = position();
+        out->next();
+    }
 }
 
 
 WriteBufferFromHTTPServerResponse::WriteBufferFromHTTPServerResponse(
+    Poco::Net::HTTPServerRequest & request_,
     Poco::Net::HTTPServerResponse & response_,
     bool compress_,
     ZlibCompressionMethod compression_method_,
     size_t size)
-    : BufferWithOwnMemory<WriteBuffer>(size), response(response_),
+    : BufferWithOwnMemory<WriteBuffer>(size), request(request_), response(response_),
     compress(compress_), compression_method(compression_method_)
 {
 }

dbms/src/IO/WriteBufferFromHTTPServerResponse.h

@@ -2,6 +2,8 @@
 
 #include <experimental/optional>
 #include <mutex>
+#include <Poco/Net/HTTPServerRequest.h>
+#include <Poco/Net/HTTPServerResponse.h>
 #include <Poco/Version.h>
 #include <IO/WriteBuffer.h>
 #include <IO/BufferWithOwnMemory.h>
@@ -41,6 +43,7 @@ namespace DB
 class WriteBufferFromHTTPServerResponse : public BufferWithOwnMemory<WriteBuffer>
 {
 private:
+    Poco::Net::HTTPServerRequest & request;
     Poco::Net::HTTPServerResponse & response;
 
     bool add_cors_header = false;
@@ -81,6 +84,7 @@ private:
 
 public:
     WriteBufferFromHTTPServerResponse(
+        Poco::Net::HTTPServerRequest & request_,
         Poco::Net::HTTPServerResponse & response_,
         bool compress_ = false,        /// If true - set Content-Encoding header and compress the result.
         ZlibCompressionMethod compression_method_ = ZlibCompressionMethod::Gzip,

dbms/src/Server/HTTPHandler.cpp

@@ -297,7 +297,7 @@ void HTTPHandler::processQuery(
     size_t buffer_size_memory = (buffer_size_total > buffer_size_http) ? buffer_size_total : 0;
 
     used_output.out = std::make_shared<WriteBufferFromHTTPServerResponse>(
-        response, client_supports_http_compression, http_response_compression_method, buffer_size_http);
+        request, response, client_supports_http_compression, http_response_compression_method, buffer_size_http);
     if (internal_compression)
         used_output.out_maybe_compressed = std::make_shared<CompressedWriteBuffer>(*used_output.out);
     else

dbms/src/Server/InterserverIOHTTPHandler.cpp

@@ -36,7 +36,7 @@ void InterserverIOHTTPHandler::processQuery(Poco::Net::HTTPServerRequest & reque
 
     ReadBufferFromIStream body(request.stream());
 
-    WriteBufferFromHTTPServerResponse out(response);
+    WriteBufferFromHTTPServerResponse out(request, response);
 
     auto endpoint = server.context().getInterserverIOHandler().getEndpoint(endpoint_name);
 

dbms/tests/queries/0_stateless/00497_whitespaces_in_insert.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 clickhouse-client -q "DROP TABLE IF EXISTS test.ws";
 clickhouse-client -q "CREATE TABLE test.ws (i UInt8) ENGINE = Memory";

dbms/tests/queries/0_stateless/00498_http_head.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+curl -s -X "HEAD" 'http://localhost:8123/?query=SELECT%201'
+curl -s -X "HEAD" 'http://localhost:8123/?query=select+*+from+system.numbers+limit+1000000'