diff --git a/buffet/http_connection.h b/buffet/http_connection.h
new file mode 100644
index 0000000..318afdc
--- /dev/null
+++ b/buffet/http_connection.h
@@ -0,0 +1,83 @@
+// Copyright 2014 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BUFFET_HTTP_CONNECTION_H_
+#define BUFFET_HTTP_CONNECTION_H_
+
+#include <string>
+#include <vector>
+
+#include <base/basictypes.h>
+
+#include "buffet/http_transport.h"
+
+namespace chromeos {
+namespace http {
+
+///////////////////////////////////////////////////////////////////////////////
+// Connection class is the base class for HTTP comminication session.
+// It abstracts the implementation of underlying transport library (ex libcurl).
+// When the Connection-derived class is constructed, it is pre-set up with
+// basic initialization information necessary to initiate the server request
+// connection (such as the URL, request method, etc - see
+// Transport::CreateConnection() for more details). But most implementations
+// would not probably initiate the physical connection until SendHeaders
+// is called.
+// You normally shouldn't worry about using this class directly.
+// http::Request and http::Response classes use it for communictaion.
+///////////////////////////////////////////////////////////////////////////////
+class Connection {
+ public:
+  Connection(std::shared_ptr<Transport> transport) : transport_(transport) {}
+  virtual ~Connection() = default;
+
+  // Called by http::Request to initiate the connection with the server.
+  // This normally opens the socket and sends the request headers.
+  virtual bool SendHeaders(const HeaderList& headers) = 0;
+  // If needed, this function can be called to send the request body data.
+  // This function can be called repeatedly until all data is sent.
+  virtual bool WriteRequestData(const void* data, size_t size) = 0;
+  // This function is called when all the data is sent off and it's time
+  // to receive the response data.
+  virtual bool FinishRequest() = 0;
+
+  // Returns the HTTP status code (e.g. 200 for success).
+  virtual int GetResponseStatusCode() const = 0;
+  // Returns the status text (e.g. for error 403 it could be "NOT AUTHORIZED").
+  virtual std::string GetResponseStatusText() const = 0;
+  // Returns the HTTP protocol version (e.g. "HTTP/1.1").
+  virtual std::string GetProtocolVersion() const = 0;
+  // Returns the value of particular response header, or empty string if the
+  // headers wasn't received.
+  virtual std::string GetResponseHeader(
+      const std::string& header_name) const = 0;
+  // Returns the response data size, if known. For chunked (streaming)
+  // transmission this might not be known until all the data is sent.
+  // In this case GetResponseDataSize() will return 0.
+  virtual uint64_t GetResponseDataSize() const = 0;
+  // This function is called to read a block of response data.
+  // It needs to be called repeatedly until it returns false or |size_read| is
+  // set to 0. |data| is the destination buffer to read the data into.
+  // |buffer_size| is the size of the buffer (amount of data to read).
+  // |read_size| is the amount of data actually read, which could be less than
+  // the size requested or 0 if there is no more data available.
+  virtual bool ReadResponseData(void* data, size_t buffer_size,
+                                size_t* size_read) = 0;
+  // Returns additional error information if any of the above functions fail.
+  virtual std::string GetErrorMessage() const = 0;
+
+ protected:
+  // |transport_| is mainly used to keep the object alive as long as the
+  // connection exists. But some implementations of Connection could use
+  // the Transport-derived class for their own needs as well.
+  std::shared_ptr<Transport> transport_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(Connection);
+};
+
+} // namespace http
+} // namespace chromeos
+
+#endif // BUFFET_HTTP_CONNECTION_H_