Using: VS 2017 Preview (15.8.3) In the file `streams.h` line 1750 method `parse` calls the protected template function `_parse_input` from a template base class. This gives an error: `cpprestsdk\release\include\cpprest\streams.h(1750): error C3861: '_parse_input': identifier not found` The solution is to prefix this call with the type: `_type_parser_base<CharType>`.