get the list of extensions that should be used for the websocket . concode_field_sep String SEC_WEBSOCKET_PROTOCOL concode_elem_sep String statusReason concode_elem_sep boolean success concode_elem_sep Map<String,List<String>> headers concode_elem_sep List<ExtensionConfig> extensions concode_elem_sep int statusCode concode_field_sep void addHeader concode_elem_sep void setAcceptedSubProtocol concode_elem_sep Map<String,List<String>> getHeaders concode_elem_sep List<String> getHeaders concode_elem_sep void setStatusCode concode_elem_sep void sendForbidden concode_elem_sep void setHeader concode_elem_sep String getHeader concode_elem_sep void setSuccess concode_elem_sep String getAcceptedSubProtocol concode_elem_sep int getStatusCode concode_elem_sep Set<String> getHeaderNames concode_elem_sep void setStatusReason concode_elem_sep String getStatusReason concode_elem_sep void setExtensions concode_elem_sep boolean isSuccess
List < ExtensionConfig > function ( ) { return extensions ; }