Web Development Quiz - Languages Golang

Free practice quiz: Web Development (Languages Golang). 54 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This Languages Golang practice quiz has 54 multiple-choice questions on Web Development, and 54 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. In Go's `net/http` package, which function is commonly used to start an HTTP server?

   1. http.ListenAndServe()
   2. http.Serve()
   3. http.Handle()
   4. http.Register()
   Show answer

   Answer: A. http.ListenAndServe()

   http.ListenAndServe() is the primary function used to start an HTTP server, listening on a specified TCP address and then serving the handler to incoming requests.

2. Which Go package is commonly used for building RESTful APIs with more advanced routing and middleware capabilities than `net/http` alone?

   1. gorilla/mux
   2. gin-gonic/gin
   3. go-chi/chi
   4. All of the above
   Show answer

   Answer: D. All of the above

   All `gorilla/mux`, `gin-gonic/gin`, and `go-chi/chi` are popular third-party frameworks that extend Go's standard `net/http` library with features like advanced routing, middleware support, request parsing, and more.

3. When using `http.ListenAndServeTLS`, what are the required arguments?

   1. Address, certificate file path, and private key file path.
   2. Address, handler, and root CA path.
   3. Handler, server name, and port.
   4. Address, certificate content, and key content.
   Show answer

   Answer: A. Address, certificate file path, and private key file path.

   `http.ListenAndServeTLS(addr, certFile, keyFile, handler)` requires the network address, the path to the TLS certificate file, and the path to the private key file.

4. Which of the following is true about Go's `http.ServeMux`?

   1. It performs exact path matching.
   2. It uses regular expressions for routing.
   3. It supports routing based on HTTP methods directly in registration.
   4. It only supports serving static files.
   Show answer

   Answer: A. It performs exact path matching.

   `http.ServeMux` matches patterns exactly. For example, `/a` will not match `/a/b`. More complex routing often requires third-party routers.

5. When should you use `http.ResponseWriter.Write` vs. `http.ResponseWriter.WriteHeader`?

   1. `WriteHeader` sets the status code and headers; `Write` sends the response body. `WriteHeader` must be called before `Write`.
   2. `Write` sets the status code and headers; `WriteHeader` sends the response body.
   3. They are interchangeable and can be called in any order.
   4. `Write` is for text, `WriteHeader` is for binary data.
   Show answer

   Answer: A. `WriteHeader` sets the status code and headers; `Write` sends the response body. `WriteHeader` must be called before `Write`.

   The HTTP response consists of a status line, headers, and a body. `WriteHeader` writes the status line and headers. `Write` writes the body. Crucially, the first call to either `WriteHeader` or `Write` implicitly writes the status line and headers if they haven't been written yet, but `WriteHeader` provides explicit control over the status code.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the purpose of the `http.HandlerFunc` type in Go's `net/http` package?
2. Which Go struct is used to represent an incoming HTTP request?
3. What does the `ResponseWriter` interface in Go's `net/http` package represent?
4. Which of the following is NOT a method available on the `http.ResponseWriter` interface for sending a response?
5. When using `http.ListenAndServe`, what is the typical default behavior if no `Handler` is provided?
6. How do you define a route that handles GET requests for the path `/users` in Go's `net/http` using `http.HandleFunc`?
7. What is the purpose of `http.ServeMux` in Go?
8. In Go's `net/http` package, how can you access query parameters from an incoming request URL?
9. What is the role of `context.Context` when handling HTTP requests in Go?
10. When a client sends a POST request with form data in Go, how can the server access this data?
11. What is the purpose of the `http.ServeFile` function?
12. Which of the following best describes the `net/http` client in Go?
13. How can you set a custom HTTP status code in Go?
14. What is the primary use of `http.NewRequest`?
15. When parsing JSON request bodies in Go, which function is commonly used?
16. What does the `http.StatusText` function do in Go?
17. To handle an OPTIONS HTTP request for a specific route in Go, what would be the most direct approach using `net/http`?
18. Which method on `http.Request` is used to get the HTTP method of the request (e.g., GET, POST)?
19. What is the function of `http.Error` in Go's `net/http` package?
20. Which `net/http` struct is used to configure server settings like timeouts?
21. What does `r.ParseMultipartForm(maxMemory)` do?
22. In Go's HTTP handlers, how do you set a custom HTTP header?
23. What is the purpose of `http.HandleFunc`?
24. Which Go package is used for building web services and APIs, often referred to as a 'microframework'?
25. What is the purpose of the `Content-Type` header in an HTTP request or response?
26. When implementing a Go web server, what is the significance of calling `defer r.Body.Close()`?
27. Which of the following is NOT a standard HTTP status code for success?
28. What is the purpose of the `net/http` client's `CheckRedirect` field?
29. When serving a JSON response in Go, what `Content-Type` header should be set?
30. What is the typical use case for `http.RedirectHandler`?
31. Which type is used to represent cookies in Go's `net/http` package?
32. How can you set a read timeout for an `http.Server`?
33. What does `r.ParseHTTPBasicAuth()` do?
34. Which of the following is a common use case for `context.WithCancel` in Go web development?
35. What is the function of `r.Cookie(name)`?
36. When using `http.FileServer`, what does it serve?
37. What is the primary role of the `User-Agent` header in an HTTP request?
38. Which Go function is typically used to start an HTTP server that requires TLS (HTTPS)?
39. In Go's `net/http`, what is the purpose of `http.ServeContent`?
40. What is the significance of `http.DefaultClient`?
41. Which of the following Go types implements the `http.Handler` interface?
42. What is the purpose of the `Host` header in an HTTP request?
43. When using `context.WithTimeout`, what happens when the timeout is reached?
44. How can you send a JSON response from a Go HTTP handler?
45. What is the primary advantage of using a third-party router like `gorilla/mux` or `chi` over `http.DefaultServeMux`?
46. Which header is used to indicate that the client prefers a response in a particular language?
47. What is the purpose of `r.ParseHTTPBasicAuth()` in relation to security?
48. When making an outbound HTTP request in Go, what `http.Client` method is typically used to send a request and receive a response?
49. What does the `http.ErrNoCookie` error signify in Go's `net/http` package?

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