Common Fiber Issues and Solutions
1. Routing Not Working as Expected
Routes return 404 errors or do not match expected patterns.
Root Causes:
- Incorrect route definitions.
- Middleware interfering with request handling.
- Case-sensitive or trailing slash inconsistencies.
Solution:
Ensure routes are correctly defined:
app := fiber.New()app.Get("/hello", func(c *fiber.Ctx) error { return c.SendString("Hello, Fiber!")})app.Listen(":3000")
Enable case-insensitive and strict routing:
app := fiber.New(fiber.Config{ CaseSensitive: false, StrictRouting: false,})
Check if middleware is interfering with route execution.
2. Middleware Not Executing Properly
Custom middleware does not execute or runs in the wrong order.
Root Causes:
- Middleware registered after route definitions.
- Middleware not correctly invoked using
Next(). - Global and local middleware conflicts.
Solution:
Register middleware before defining routes:
app.Use(func(c *fiber.Ctx) error { fmt.Println("Middleware executed") return c.Next()})
Ensure middleware uses c.Next() to pass control:
func loggerMiddleware(c *fiber.Ctx) error { fmt.Println("Request received") return c.Next()}
3. CORS Not Working
Requests from a different origin are blocked due to CORS restrictions.
Root Causes:
- CORS middleware not properly configured.
- Browser blocking cross-origin requests.
- Headers missing in the response.
Solution:
Use the CORS middleware:
app.Use(cors.New(cors.Config{ AllowOrigins: "*", AllowMethods: "GET,POST,PUT,DELETE",}))
Ensure preflight requests are handled correctly:
app.Options("/*", func(c *fiber.Ctx) error { c.Set("Access-Control-Allow-Origin", "*") return c.SendStatus(204)})
4. Database Connection Failing
The application fails to connect to the database.
Root Causes:
- Incorrect database credentials.
- Database service not running.
- Connection pooling issues.
Solution:
Ensure correct database credentials:
db, err := sql.Open("postgres", "user=admin password=secret dbname=mydb sslmode=disable")
Check if the database service is running:
systemctl status postgresql
Use connection pooling for better performance:
db.SetMaxOpenConns(20)db.SetMaxIdleConns(10)
5. Request Handling Bottlenecks
The application slows down under high traffic.
Root Causes:
- Blocking operations within request handlers.
- Heavy computation inside handlers.
- Improper use of goroutines for concurrent processing.
Solution:
Use goroutines for non-blocking tasks:
app.Get("/async", func(c *fiber.Ctx) error { go func() { time.Sleep(2 * time.Second) fmt.Println("Async operation complete") }() return c.SendString("Request received")})
Optimize database queries:
rows, err := db.Query("SELECT * FROM users LIMIT 100")
Enable gzip compression for responses:
app.Use(compress.New())
Best Practices for Fiber Development
- Enable request logging to monitor API calls.
- Use middleware for security and performance optimizations.
- Ensure proper error handling to prevent crashes.
- Implement caching for frequently accessed data.
- Test API performance under load before deployment.
Conclusion
By troubleshooting routing issues, middleware execution problems, CORS misconfigurations, database connection failures, and request handling inefficiencies, developers can ensure a stable and high-performance Fiber application. Implementing best practices enhances maintainability and scalability.
FAQs
1. Why are my Fiber routes not working?
Check route definitions, enable case-insensitive routing, and ensure middleware is not interfering.
2. How do I fix middleware execution issues?
Ensure middleware is registered before routes and includes c.Next() for execution flow.
3. Why are CORS requests being blocked?
Ensure CORS middleware is configured correctly and that preflight requests are handled properly.
4. How do I resolve database connection failures?
Verify credentials, ensure the database service is running, and optimize connection pooling.
5. How can I improve Fiber performance?
Use goroutines for asynchronous tasks, enable gzip compression, and optimize database queries.