var request = URLRequest(url: url) request.httpMethod = "POST" request.setValue("application/json", forHTTPHeaderField: "Content-Type") let jsonBody = ["name": "John"] request.httpBody = try?

medium📝 Predict Output Q4 of 15

iOS Swift - Networking

Given the Swift code below, what will be the value of 'responseString' after the POST request completes successfully? let url = URL(string: "https://example.com/api")! var request = URLRequest(url: url) request.httpMethod = "POST" request.setValue("application/json", forHTTPHeaderField: "Content-Type") let jsonBody = ["name": "John"] request.httpBody = try? JSONSerialization.data(withJSONObject: jsonBody) // Assume server responds with JSON: {"status":"success"} // After data task, responseString is set to String(data: data, encoding: .utf8)

A{"status":"success"}

B{"name":"John"}

Cnil

DAn error message string

Step-by-Step Solution

Solution:

Step 1: Understand request and response flow
The request sends JSON with name John; server responds with JSON {"status":"success"}.
Step 2: Convert response data to string
responseString is created from server response data, so it contains the server's JSON string.
Final Answer:
{"status":"success"} -> Option A
Quick Check:
Response string = A [OK]

Quick Trick: Response string shows server reply, not request body [OK]

Common Mistakes:

Confusing request body with response
Expecting request JSON as response
Assuming nil or error without checking

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var request = URLRequest(url: url) request.httpMethod = "POST" request.setValue("application/json", forHTTPHeaderField: "Content-Type") let jsonBody = ["name": "John"] request.httpBody = try?

Step 1: Understand request and response flow

Step 2: Convert response data to string

Final Answer:

Quick Check:

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