goLogic errorMedium

Unexpected TCP socket connection leak in HTTP client

Time: 0:00

BugFind the bug and fix the code

What it should do

Fetch data from a given URL and return the response body as a string. Example: fetchHTTPPayload("http://example.com") -> "response body"

What happens instead

No explicit error message, but the application shows signs of resource exhaustion over time.

package main

import (
	"io/ioutil"
	"net/http"
	"fmt"
)

func fetchHTTPPayload(url string) (string, error) {
	resp, err := http.Get(url)
	if err!= nil {
		return "", err
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err!= nil {
		return "", err
	}
	return string(body), nil
}

func main() {
	data, err := fetchHTTPPayload("http://example.com")
	if err!= nil {
		fmt.Println(err)
	}
	fmt.Println(data)
}

Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).

⏱️0:00

Hints

🏆 0 hints = Flawless Solve

Think & Test Cooldown

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Hint 2

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Hint 3

Unlocks after Hint 2

This bug belongs to the logic errors pattern

The wrong operator, an inverted condition, a formula the right way round but backwards.

Learn the logic errors pattern Step through your own code

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package main import ( "io/ioutil" "net/http" "fmt" ) func fetchHTTPPayload(url string) (string, error) { resp, err := http.Get(url) if err!= nil { return "", err } body, err := ioutil.ReadAll(resp.Body) if err!= nil { return "", err } return string(body), nil } func main() { data, err := fetchHTTPPayload("http://example.com") if err!= nil { fmt.Println(err) } fmt.Println(data) }

Unexpected TCP socket connection leak in HTTP client

What it should do

What happens instead

More logic errors to practise

Unexpected TCP socket connection leak in HTTP client

What it should do

What happens instead

More logic errors to practise