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Building web services - intro talk/video (24 mins) 
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Building web services - talk/video (90+ mins) 
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Intro tutorial using tiger tonic 
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Intro tutorial using redis for persistence 
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Three part tutorial by Steven White: 
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Routing RESTful controllers - a post by Matt Ryer 
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Quik-N-Eazy - “A quick and easy way to setup a RESTful JSON API” 
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Testflight - utility for painless HTTP testing 
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Building a testable Go web app - SourceGraph post based on a talk given by Quinn Slack at Pivotal Labs 
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Testing in Go - thoughts by Will Norris 
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Structuring tests in Go - recommendations by Ben Johnson 
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Introducing Silk - Markdown-driven API tests 
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Take a REST with HTTP/2, Protobufs, and Swagger - CoreOS blog post 
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gRPC Go - talk by Sameer Ajmani of the Go Team 
For additional tutorials and example code, see this gist.