diff --git a/include/winhttp.h b/include/winhttp.h
index 33fc1f915dd..ddfda480880 100644
--- a/include/winhttp.h
+++ b/include/winhttp.h
@@ -762,6 +762,54 @@ typedef struct _WINHTTP_REQUEST_STATS
     ULONGLONG rgullStats[WinHttpRequestStatMax];
 } WINHTTP_REQUEST_STATS, *PWINHTTP_REQUEST_STATS;
 
+typedef enum _WINHTTP_WEB_SOCKET_OPERATION
+{
+    WINHTTP_WEB_SOCKET_SEND_OPERATION     = 0,
+    WINHTTP_WEB_SOCKET_RECEIVE_OPERATION  = 1,
+    WINHTTP_WEB_SOCKET_CLOSE_OPERATION    = 2,
+    WINHTTP_WEB_SOCKET_SHUTDOWN_OPERATION = 3
+} WINHTTP_WEB_SOCKET_OPERATION;
+
+typedef enum _WINHTTP_WEB_SOCKET_BUFFER_TYPE
+{
+    WINHTTP_WEB_SOCKET_BINARY_MESSAGE_BUFFER_TYPE  = 0,
+    WINHTTP_WEB_SOCKET_BINARY_FRAGMENT_BUFFER_TYPE = 1,
+    WINHTTP_WEB_SOCKET_UTF8_MESSAGE_BUFFER_TYPE    = 2,
+    WINHTTP_WEB_SOCKET_UTF8_FRAGMENT_BUFFER_TYPE   = 3,
+    WINHTTP_WEB_SOCKET_CLOSE_BUFFER_TYPE           = 4
+} WINHTTP_WEB_SOCKET_BUFFER_TYPE;
+
+typedef enum _WINHTTP_WEB_SOCKET_CLOSE_STATUS
+{
+    WINHTTP_WEB_SOCKET_SUCCESS_CLOSE_STATUS                = 1000,
+    WINHTTP_WEB_SOCKET_ENDPOINT_TERMINATED_CLOSE_STATUS    = 1001,
+    WINHTTP_WEB_SOCKET_PROTOCOL_ERROR_CLOSE_STATUS         = 1002,
+    WINHTTP_WEB_SOCKET_INVALID_DATA_TYPE_CLOSE_STATUS      = 1003,
+    WINHTTP_WEB_SOCKET_EMPTY_CLOSE_STATUS                  = 1005,
+    WINHTTP_WEB_SOCKET_ABORTED_CLOSE_STATUS                = 1006,
+    WINHTTP_WEB_SOCKET_INVALID_PAYLOAD_CLOSE_STATUS        = 1007,
+    WINHTTP_WEB_SOCKET_POLICY_VIOLATION_CLOSE_STATUS       = 1008,
+    WINHTTP_WEB_SOCKET_MESSAGE_TOO_BIG_CLOSE_STATUS        = 1009,
+    WINHTTP_WEB_SOCKET_UNSUPPORTED_EXTENSIONS_CLOSE_STATUS = 1010,
+    WINHTTP_WEB_SOCKET_SERVER_ERROR_CLOSE_STATUS           = 1011,
+    WINHTTP_WEB_SOCKET_SECURE_HANDSHAKE_ERROR_CLOSE_STATUS = 1015
+} WINHTTP_WEB_SOCKET_CLOSE_STATUS;
+
+typedef struct _WINHTTP_WEB_SOCKET_ASYNC_RESULT
+{
+    WINHTTP_ASYNC_RESULT AsyncResult;
+    WINHTTP_WEB_SOCKET_OPERATION Operation;
+} WINHTTP_WEB_SOCKET_ASYNC_RESULT;
+
+typedef struct _WINHTTP_WEB_SOCKET_STATUS
+{
+    DWORD dwBytesTransferred;
+    WINHTTP_WEB_SOCKET_BUFFER_TYPE eBufferType;
+} WINHTTP_WEB_SOCKET_STATUS;
+
+#define WINHTTP_WEB_SOCKET_MAX_CLOSE_REASON_LENGTH   123
+#define WINHTTP_WEB_SOCKET_MIN_KEEPALIVE_VALUE     15000
+
 #ifdef __cplusplus
 extern "C" {
 #endif