APIs
Idempotency Keys in Go APIs for Safe Client Retries
Make POST safe to retry in a Go API with an Idempotency-Key middleware: concurrent duplicates, replayed responses, payload fingerprints and 5xx handling.
12 min read
Library
Everything you need to level up your coding skills.
Web
Health Check and Readiness Endpoints in Go Services
Write liveness, readiness and startup endpoints for a Go service: what each should check, how to bound dependency checks, and how readiness fits shutdown.
7 min read
Web
Go HTTP Cheat Sheet for Servers and Clients in One Page
A one page Go HTTP cheat sheet: server settings, routing, JSON helpers, middleware, shutdown, a safe client, status codes and headers, all run together.
8 min read
APIs
Generate a Typed Go Client From an OpenAPI Document
Generate a typed Go client from an OpenAPI file with oapi-codegen, then wrap it: auth by request editor, Go errors from problem documents and a drift check.
12 min read
Web
Download a File in Go With Progress and Resume Support
Download a large file in Go into a partial file, report progress, resume with Range and If-Range after a failure, and rename it into place when complete.
10 min read
Web
Build a Server Rendered Todo App With Templ and HTMX
Build a todo app in Go with templ, HTMX and SQLite where every action works as a plain form post and upgrades to fragment updates, with tests for both paths.
21 min read
APIs
Bulk Endpoints in Go APIs and Handling Partial Failure
Design bulk endpoints in Go: atomic versus partial modes, per-item results by index, savepoints, idempotent refs, limits, and 100 creates in 1.2 ms not 18.
16 min read
Web
Configuration for Go Web Apps From Env Vars and Files
Load Go web app configuration from defaults, a file, environment variables and flags in a fixed order, read secrets from files and report every error at once.
10 min read
APIs
The Validator Package in Go and Its Sharp Edges to Know
Use go-playground/validator in a Go API: tags, nested rules, JSON field names in errors, and the traps around zero values, dive, panics and per-call setup.
15 min read
Web
Host Based Routing and Multi Tenant Servers in Go Apps
Resolve the tenant from the Host header in a Go server, with subdomains and custom domains, safe fallbacks, a context value and rules for unknown hosts.
7 min read
WebGuide
Internationalization in Go Web Apps With Plain Tools
Internationalize a Go web app with embedded JSON catalogs and golang.org/x/text: language negotiation, plural forms, number formats and missing translations.
15 min read
APIs
Stream JSON in Go With the Encoder and Decoder Types
Stream JSON in Go without loading it all: an iterator over a top-level array, NDJSON with a Decoder, element-by-element encoding and a live heap of 0.02 MB.
11 min read
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