I’m currently developing a simple go-based web service and a CLI client for it. The following are some useful articles and resources specifically focused on HTTP API development and design, listed here for future reference.
For more general golang web development materials, see this gist.
the newstack tutorial - nice walkthrough of the basics with sample code for each iteration
how i start - tutorial demonstrating how to setup a basic REST API which utilizes some existing REST APIs
basic demo - just the basics, representing a users resource.
web service demo - implements a RESTful CRUD API with MongoDB for persistence, also representing a users resource.
boltdb demo - a simple guestbook app using boltdb for persistence.
basics - basic conventions for developing web apis
quick reference - nice reference with a summary a [basic tips](http://www.restapitutorial.com/lessons/ restquicktips.html)
design guide - best practices for designing HTTP+JSON APIs
testing http client code - recommendations for testing your client code using Go’s httptest package, from the creator of go-github, Will Norris.
patch strategies - a technique for marshalling structs with intentionally empty values when doing partial updates with PATCH, also from Will Norris.