Represent URLRequest as a CURL string for easy debugging

URLRequest+Curl.swift

extension URLRequest {

    func curlString() -> String {
        var curl = "curl --insecure"

        // Method
        if let method = httpMethod {
            curl += " -X \(method)"
        }

        // Headers
        for (name, val) in allHTTPHeaderFields ?? [:] {
            curl += " -H '\(name): \(val)'"
        }

        // Body
        if let body = httpBody {
            // Should work in most cases
            if let string = String(data: body, encoding: .utf8)?.replacingOccurrences(of: "'", with: "\\'") {
                curl += " --data-binary '\(string)'"

            } else {
                curl += " --data-binary 'ERR_NOT_A_STRING'"
            }
        }

        // URL
        if let url = url?.absoluteString {
            curl += " \(url)"
        } else {
            curl += " ERR_NO_URL"
        }

        return curl
    }
}