Code Explainers

Gin code explainers

go 
package api
 
import (
	"crypto/sha256"

ETag conditional requests in Gin

http-caching etag conditional-requests
Intermediate 6 steps
go 
package middleware
 
import (
	"net/http"

Per-plan export limits in Gin middleware

middleware rate-limiting authorization
Intermediate 7 steps
go 
package signup
 
var wizardCodec = securecookie.New(
	[]byte(os.Getenv("WIZARD_HASH_KEY")),

A cookie-backed signup wizard in Gin

cookies encryption multi-step-form
Intermediate 9 steps
go 
func UpdateArticle(store *ArticleStore) gin.HandlerFunc {
	return func(c *gin.Context) {
		id := c.Param("id")
 

Optimistic concurrency with If-Match in Gin

optimistic-locking http-preconditions etag
Intermediate 9 steps
go 
package handlers
 
import (
	"net/http"

Custom struct-level validation in Gin

validation struct-tags cross-field
Intermediate 7 steps
go 
package routing
 
import (
	"net/http"

Region-aware upstream routing in Gin

middleware concurrency load-balancing
Advanced 8 steps
go 
func HandleWebhook(store WebhookStore, dispatcher *EventDispatcher) gin.HandlerFunc {
	return func(c *gin.Context) {
		body, err := c.GetRawData()
		if err != nil {

Building a resilient webhook handler in Gin

webhooks dependency-injection signature-verification
Intermediate 9 steps
go 
func StreamLogs(c *gin.Context) {
	path := c.Query("file")
	if path == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "missing file parameter"})

Streaming a live log tail with SSE in Gin

server-sent-events streaming channels
Advanced 10 steps
go 
package middleware
 
import (
	"crypto/subtle"

Timing-safe API key auth in Gin

middleware authentication constant-time-compare
Intermediate 8 steps
go 
package handlers
 
import (
	"context"

A custom Gin validator backed by Redis

validation redis struct-tags
Intermediate 8 steps
go 
func ServeThumbnail(c *gin.Context) {
	raw := c.Param("token")
	sig := c.Query("sig")
 

A signed thumbnail endpoint in Gin

signed-urls image-processing http-handler
Intermediate 9 steps
go 
package middleware
 
import (
	"hash/fnv"

A percentage feature-rollout middleware in Gin

feature-flags middleware hashing
Intermediate 6 steps
go 
package middleware
 
import (
	"github.com/gin-gonic/gin"

Injecting a scoped GORM query via Gin middleware

middleware dependency-injection request-context
Intermediate 9 steps
go 
package handlers
 
import (
	"net/http"

Locale-aware pricing in a Gin handler

internationalization content-negotiation currency-formatting
Intermediate 9 steps
go 
type Warning struct {
	Field   string `json:"field"`
	Code    string `json:"code"`
	Message string `json:"message"`

Partial-success responses in Gin

error-handling input-validation http-status
Intermediate 8 steps
go 
package middleware
 
import (
	"crypto/hmac"

Verifying signed URLs with Gin middleware

hmac middleware authentication
Intermediate 8 steps
go 
package middleware
 
import (
	"fmt"

How a panic-recovery middleware works in Gin

middleware panic-recovery error-reporting
Intermediate 8 steps
go 
func UploadDocument(c *gin.Context) {
	fileHeader, err := c.FormFile("file")
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "file is required"})

Handling multipart uploads in Gin

multipart-upload validation error-handling
Intermediate 9 steps