Add some features in a C++ open source project

I am looking for someone to add some minor features to an existing C++ open source project for me. I have detailed specifications for the features, and I'm looking for someone who can complete the project in 1 day (today). The perfect person for this job is someone with expertise in C++, open source projects and developing features. If you think you would be a great fit for this project, please let me know.

The project is an open source tool built in C++, I need the following things:
- Custom headers (for authentication purposes when it's sending POST requests)
- Raw body in the POST request

More details, by PM.