swift 中带有 NSURLRequest 的 HTTP 标头

使用 Swift 中的 NSURLRequest 可以轻松地为 HTTP 请求添加标头。标头是在 HTTP 请求中传递附加信息的一种方式，它可以包含各种各样的信息，如身份验证凭据、用户代理、内容类型等。在本文中，我们将学习如何使用 NSURLRequest 的 HTTP 标头功能，并提供一些示例代码来帮助您更好地理解。

swift
let url = URL(string: "https://www.example.com/api")
var request = URLRequest(url: url!)
request.allHTTPHeaderFields = [
    "Authorization": "Bearer YOUR_AUTH_TOKEN",
    "User-Agent": "MyApp/1.0",
    "Content-Type": "application/json"
]

swift
let url = URL(string: "https://www.example.com/api")
let request = URLRequest(url: url!)
if let headers = request.allHTTPHeaderFields {
    if let authorization = headers["Authorization"] {
        print("Authorization: \(authorization)")
    }
    if let userAgent = headers["User-Agent"] {
        print("User-Agent: \(userAgent)")
    }
    if let contentType = headers["Content-Type"] {
        print("Content-Type: \(contentType)")
    }
}

swift
import Foundation
let url = URL(string: "https://www.example.com/api")
var request = URLRequest(url: url!)
// 添加标头
request.allHTTPHeaderFields = [
    "Authorization": "Bearer YOUR_AUTH_TOKEN",
    "User-Agent": "MyApp/1.0",
    "Content-Type": "application/json"
]
// 读取标头
if let headers = request.allHTTPHeaderFields {
    if let authorization = headers["Authorization"] {
        print("Authorization: \(authorization)")
    }
    if let userAgent = headers["User-Agent"] {
        print("User-Agent: \(userAgent)")
    }
    if let contentType = headers["Content-Type"] {
        print("Content-Type: \(contentType)")
    }
}