Segmentation violation with golang channels

Question

The below code opens 10,000 go routines, which make HTTP calls, get the response, close the response, and write to a channel with an ID.

In the second for loop, it prints out from that buffered channel the ID of the previous go routine.

This causes a segmentation violation, and I can't figure out why.

Panic:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x40 pc=0x2293]

Code:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    requests := 10000
    ch := make(chan string, requests)
    for i := 1; i <= requests; i++ {
        go func(iter int) {
            fmt.Println(iter)
            resp, _ := http.Get("http://localhost:8080/api/project")
            resp.Body.Close()
            ch <- fmt.Sprint("%i", iter)
        }(i)
    }
    for i := 1; i <= requests; i++ {
        fmt.Println(<-ch)
    }
}

Solution

You do not check for any error when calling the api. Thus the error when trying to close a response that never arrived.

This code does not panic:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    requests := 10000
    ch := make(chan string, requests)
    for i := 1; i <= requests; i++ {
        go func(iter int) {
            fmt.Println(iter)
            resp, err := http.Get("http://localhost:8080/api/project")
            if (err == nil) {
              resp.Body.Close()
            }
            ch <- fmt.Sprint(iter)
        }(i)
    }
    for i := 1; i <= requests; i++ {
        fmt.Println(<-ch)
    }
}