POST request with JSON body in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a URL object from a string.

iOS Swift

guard let url = URL(string: [1]) else { return }

Drag options to blanks, or click blank then click option'

A"https://api.example.com/data"

BURL(string: "https://api.example.com/data")

Chttps://api.example.com/data

DurlString

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around the URL string.

Passing a variable name without quotes if it's not defined.

The URL initializer requires a string literal or variable of type String. The string must be quoted.

2fill in blank

medium

Complete the code to set the HTTP method to POST.

iOS Swift

var request = URLRequest(url: url)
request.httpMethod = [1]

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A"POST"

B"GET"

CPOST

Dpost

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase method names without quotes.

Passing the method name without quotes.

The httpMethod property expects a string with the HTTP method name in uppercase and quotes.

3fill in blank

hard

Fix the error in setting the Content-Type header for JSON.

iOS Swift

request.setValue([1], forHTTPHeaderField: "Content-Type")

Drag options to blanks, or click blank then click option'

Aapplication/json

Bjson

C"application/json"

D"application/xml"

Attempts:

3 left

💡 Hint

Common Mistakes

Using unquoted strings.

Using wrong MIME types like application/xml.

The Content-Type header value must be a string with the exact MIME type for JSON, quoted.

4fill in blank

hard

Fill both blanks to encode a dictionary as JSON data and assign it to the request body.

iOS Swift

let json: [String: Any] = ["name": "John", "age": 30]
request.httpBody = try? JSONSerialization.[1](withJSONObject: json, options: .[2])

Drag options to blanks, or click blank then click option'

Adata

BjsonObject

CprettyPrinted

DfragmentsAllowed

Attempts:

3 left

💡 Hint

Common Mistakes

Using jsonObject instead of data method.

Passing invalid options.

The method to convert JSON to Data is 'data', and 'prettyPrinted' is a valid option for formatting.

5fill in blank

hard

Fill all three blanks to create a URLSession data task that sends the request and handles the response.

iOS Swift

let task = URLSession.shared.dataTask(with: request) { data, response, error in
  guard let [1] = data, error == nil else { return }
  if let httpResponse = response as? [2], httpResponse.statusCode == [3] {
    print("Success")
  }
}
task.resume()

Drag options to blanks, or click blank then click option'

AresponseData

BHTTPURLResponse

C200

DURLResponse

Attempts:

3 left

💡 Hint

Common Mistakes

Using URLResponse instead of HTTPURLResponse for statusCode.

Using wrong status code numbers.

The data is assigned to a variable (responseData), the response cast to HTTPURLResponse, and 200 is the success status code.