/// <summary>
/// 封装HttpOption的Send扩展方法发送HTTP请求，并提供失败重试功能。
/// 如果遇到WebException异常，就转换成RemoteWebException异常
/// </summary>
/// <param name="option">HttpOption实例，用于包含HTTP请求的发送参数</param>
/// <param name="retry">提供一个Retry实例，用于指示如何执行重试。如果此参数为NULL则不启用重试</param>
/// <returns></returns>
public static T GetResult <T>(this HttpOption option, Retry retry = null)
{
try {
if (retry == null)
{
return(option.Send <T>());
}
else
{
return(retry.Run(option.Send <T>));
}
}
catch (WebException ex) {
// 返回一个容易获取异常消息的异常类型
throw new RemoteWebException(ex, option.Url);
}
}
/// <summary>
/// 封装HttpOption的Send扩展方法发送HTTP请求，并提供失败重试功能。
/// 如果遇到WebException异常，就转换成RemoteWebException异常
/// </summary>
/// <param name="option">HttpOption实例，用于包含HTTP请求的发送参数</param>
/// <param name="retry">提供一个Retry实例，用于指示如何执行重试。如果此参数为NULL将采用默认重试规则</param>
/// <returns></returns>
public static T GetResult <T>(this HttpOption option, Retry retry)
{
if (retry == null)
{
retry = GetDefaultRetry();
}
try {
return(retry.Run <T>(() => {
return option.Send <T>();
}));
}
catch (WebException ex) {
// 返回一个容易获取异常消息的异常类型
throw new RemoteWebException(ex);
}
}
/// <summary>
/// 封装HttpOption的Send扩展方法发送HTTP请求，并提供失败重试功能。
/// 如果遇到WebException异常，就转换成RemoteWebException异常
/// </summary>
/// <param name="option">HttpOption实例，用于包含HTTP请求的发送参数</param>
/// <param name="retry">提供一个Retry实例，用于指示如何执行重试。如果此参数为NULL则不启用重试</param>
/// <returns></returns>
public async static Task <string> GetResultAsync(this HttpOption option, Retry retry = null)
{
try {
if (retry == null)
{
return(await option.SendAsync());
}
else
{
return(await retry.RunAsync(option.SendAsync));
}
}
catch (WebException ex) {
// 返回一个容易获取异常消息的异常类型
throw new RemoteWebException(ex, option.Url);
}
}
/// <summary>
/// 封装HttpOption的Send扩展方法发送HTTP请求，并提供失败重试功能。
/// 如果遇到WebException异常，就转换成RemoteWebException异常
/// </summary>
/// <param name="option">HttpOption实例，用于包含HTTP请求的发送参数</param>
/// <param name="retry">提供一个Retry实例，用于指示如何执行重试。如果此参数为NULL将采用默认重试规则</param>
/// <returns></returns>
public async static Task <string> GetResultAsync(this HttpOption option, Retry retry)
{
if (retry == null)
{
retry = GetDefaultRetry();
}
try {
return(await retry.RunAsync <string>(async() => {
return await option.SendAsync();
}));
}
catch (WebException ex) {
// 返回一个容易获取异常消息的异常类型
throw new RemoteWebException(ex);
}
}
/// <summary>
/// 根据指定的HttpOption参数，用【异步】方式发起一次HTTP请求
/// </summary>
/// <typeparam name="T">返回值的类型参数</typeparam>
/// <param name="option">HttpOption的实例，用于描述请求参数</param>
/// <returns>返回服务端的调用结果，并转换成指定的类型</returns>
public async static Task <T> SendAsync <T>(this HttpOption option)
{
if (option == null)
{
throw new ArgumentNullException("option");
}
option.CheckInput();
HttpClient client = ObjectFactory.New <HttpClient>();
bool urlQuery = option.IsMustQueryString();
string requestUrl = option.Url;
if (option.Data != null && urlQuery) //GET 请求，需要将参数合并到URL，形成查询字符串参数
{
if (option.Url.IndexOf('?') < 0)
{
requestUrl = option.Url + "?" + GetQueryString(option.Data);
}
else
{
requestUrl = option.Url + "&" + GetQueryString(option.Data);
}
}
HttpWebRequest request = client.CreateWebRequest(requestUrl);
SetWebRequest(request, option);
option.SetRequestAction?.Invoke(request); // 调用委托
if (option.Data != null && urlQuery == false) // POST提交数据
{
await client.SetRequestDataAsync(option.Data, option.Format);
}
using (HttpWebResponse response = await client.GetResponseAsync()) {
option.ReadResponseAction?.Invoke(response); // 调用委托
return(client.GetResult <T>(response));
}
}
private static void SetWebRequest(HttpWebRequest request, HttpOption option)
{
request.Method = option.Method;
foreach (NameValue item in option.Headers)
{
request.Headers.InternalAdd(item.Name, item.Value);
}
if (option.Cookie != null)
{
request.CookieContainer = option.Cookie;
}
if (option.Credentials != null)
{
request.Credentials = option.Credentials; // CredentialCache.DefaultCredentials;
}
if (option.Timeout.HasValue)
{
request.Timeout = option.Timeout.Value;
}
if (string.IsNullOrEmpty(option.ContentType) == false)
{
request.ContentType = option.ContentType;
}
if (string.IsNullOrEmpty(option.UserAgent) == false)
{
request.UserAgent = option.UserAgent;
}
if (option.DisableAutoRedirect)
{
request.AllowAutoRedirect = false;
}
}
/// <summary>
/// 根据原始请求信息文本构建 HttpOption 对象（格式可参考Fiddler的Inspectors标签页内容）
/// </summary>
/// <param name="text"></param>
/// <returns></returns>
public static HttpOption FromRawText(string text)
{
// 示例数据：
//POST http://www.fish-mvc-demo.com/Ajax/ns/TestAutoAction/submit.aspx HTTP/1.1
//Host: www.fish-mvc-demo.com
//User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0
//Accept: */*
//Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
//Accept-Encoding: gzip, deflate
//Content-Type: application/x-www-form-urlencoded; charset=UTF-8
//X-Requested-With: XMLHttpRequest
//Referer: http://www.fish-mvc-demo.com/Pages/Demo/TestAutoFindAction.htm
//Content-Length: 72
//Cookie: hasplmlang=_int_; LoginBy=productKey; PageStyle=Style2;
//Connection: keep-alive
//Pragma: no-cache
//Cache-Control: no-cache
//input=Fish+Li&Base64=%E8%BD%AC%E6%8D%A2%E6%88%90Base64%E7%BC%96%E7%A0%81
if (string.IsNullOrEmpty(text))
{
throw new ArgumentNullException("text");
}
HttpOption option = new HttpOption();
option.ContentType = null;
using (StringReader reader = new StringReader(text.Trim())) {
string firstLine = reader.ReadLine();
int p1 = firstLine.IndexOf(' ');
int p2 = firstLine.LastIndexOf(' ');
if (p1 < 0 || p1 == p2)
{
throw new ArgumentException("不能识别的请求文本格式。");
}
option.Method = firstLine.Substring(0, p1);
// 不使用HTTP协议版本，只做校验。
string httpVersion = firstLine.Substring(p2 + 1);
if (httpVersion.StartsWith("HTTP/") == false)
{
throw new ArgumentException("不能识别的请求文本格式。");
}
option.Url = firstLine.Substring(p1 + 1, p2 - p1 - 1);
string line = null;
while ((line = reader.ReadLine()) != null)
{
if (line.Length > 0)
{
// 处理请求头
int p3 = line.IndexOf(':');
if (p3 > 0)
{
string name = line.Substring(0, p3);
string value = line.Substring(p3 + 2); // 2 表示2个字符，一个冒号，一个空格
option.Headers.Add(name, value);
}
else
{
throw new ArgumentException("不能识别的请求文本格式。");
}
}
else
{
break;
}
}
// 请求体数据
string postText = reader.ReadToEnd();
if (string.IsNullOrEmpty(postText) == false)
{
option.Data = postText;
}
}
string contentType = option.Headers["Content-Type"];
if (contentType != null)
{
int p = contentType.IndexOf("; charset=");
// 注意：这里丢弃了 charset 设置，因为 HttpClient 固定以 utf-8 编码方式发送请求！
if (p > 0)
{
option.ContentType = contentType.Substring(0, p);
}
else
{
option.ContentType = contentType;
}
option.Headers.Remove("Content-Type");
}
return(option);
}
/// <summary>
/// 根据指定的HttpOption参数，用【异步】方式发起一次HTTP请求
/// </summary>
/// <param name="option">HttpOption的实例，用于描述请求参数</param>
/// <returns>返回服务端的调用结果，并转换成指定的类型</returns>
public async static Task <string> SendAsync(this HttpOption option)
{
return(await SendAsync <string>(option));
}
/// <summary>
/// 根据指定的HttpOption参数，用【同步】方式发起一次HTTP请求
/// </summary>
/// <param name="option">HttpOption的实例，用于描述请求参数</param>
/// <returns>返回服务端的调用结果，并转换成指定的类型</returns>
public static string Send(this HttpOption option)
{
return(Send <string>(option));
}
