Wayback() is causing a crash

[ram-on]

Bug Report

Current Behavior
The below code is causing the the program to crash:

package main

import (
	"context"
	"fmt"
	"net/url"
	"time"

	is "github.com/wabarc/archive.is"
)

func main() {
	wbrc := &is.Archiver{}
	url, _ := url.Parse(`https://gnu.org`)
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
	defer cancel()

	println("Archiving...")
	if result, err := wbrc.Wayback(ctx, url); err != nil {
		fmt.Printf("ERROR:  %v\n", err)
	} else {
		fmt.Printf("Success: %v\n", result)
	}
}

The TTY output:

Archiving...
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x5e326e]

goroutine 1 [running]:
net/http.(*Client).deadline(0x40bea7?)
	/usr/lib/go-1.21/src/net/http/client.go:194 +0xe
net/http.(*Client).do(0x0, 0xc000182100)
	/usr/lib/go-1.21/src/net/http/client.go:608 +0x209
net/http.(*Client).Do(...)
	/usr/lib/go-1.21/src/net/http/client.go:590
github.com/wabarc/archive%2eis.(*Archiver).Do(0xc000199ef0, 0xc000182100)
	/home/ramon/src/go/pkg/mod/github.com/wabarc/archive.is@v1.4.0/is.go:97 +0x74
github.com/wabarc/archive%2eis.(*Archiver).getSubmitID(0x4?, {0x6e41b5, 0x12})
	/home/ramon/src/go/pkg/mod/github.com/wabarc/archive.is@v1.4.0/is.go:213 +0x38b
github.com/wabarc/archive%2eis.(*Archiver).getValidDomain.func1({0x919fa0?, 0x7, 0x0?})
	/home/ramon/src/go/pkg/mod/github.com/wabarc/archive.is@v1.4.0/is.go:241 +0x8c
github.com/wabarc/archive%2eis.(*Archiver).getValidDomain(0xc000199ef0, 0xc000199e58)
	/home/ramon/src/go/pkg/mod/github.com/wabarc/archive.is@v1.4.0/is.go:252 +0x83
github.com/wabarc/archive%2eis.(*Archiver).archive(0xc000199ef0, {0x75d2b0, 0xc0001920e0}, 0xc000199e58, 0x439114?)
	/home/ramon/src/go/pkg/mod/github.com/wabarc/archive.is@v1.4.0/is.go:136 +0x6e
github.com/wabarc/archive%2eis.(*Archiver).Wayback(0x6e199d?, {0x75d2b0?, 0xc0001920e0?}, 0xc0000061a0?)
	/home/ramon/src/go/pkg/mod/github.com/wabarc/archive.is@v1.4.0/is.go:113 +0x3b
main.main()
	/home/ramon/src/go/src/test/main.go:33 +0xc8
exit status 2

Expected behavior/code
The code should not crash.

Environment

• github.com/wabarc/archive.is v1.4.0
• go1.21.1 linux/amd64
• Ubuntu 23.10

Possible Solution
N/A

Additional context/Screenshots
N/A

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