/// <summary>
/// 将流分析成Header集合和Body内存流
/// </summary>
/// <param name="_out"></param>
/// <returns></returns>
public static HttpInfo Parse(Stream _out)
{
var info = new HttpInfo();
int position = 0;
string firstLine = "";
info.Headers = ParseHeader(_out, ref position, ref firstLine);
info.FirstLine = firstLine;
info.Content = ToMemStream(_out);
return info;
}
/// <summary>
/// 缓存没过期，直接输出缓存
/// </summary>
/// <param name="context"></param>
/// <param name="key"></param>
/// <param name="info"></param>
private void ResponceCache(HttpContext context, string key, CacheInfo info)
{
var req = context.Request;
var rep = context.Response;
string time = info.StoreTime.ToString("r");
if (req.Headers["If-Modified-Since"] == time)
{
rep.StatusCode = (int)System.Net.HttpStatusCode.NotModified;
LogHelp.Info("cache hit 304 " + req.RawUrl);
}
else
{
var httpInfo = new HttpInfo();
var _stream = Store.Get(key);
int headEndPosition = 0;
string firstLine = "";
httpInfo.Headers = HttpParseHelp.ParseHeader(_stream, ref headEndPosition, ref firstLine);
rep.StatusCode = ParseRespondCode(firstLine);
if (rep.StatusCode == 200)
{
rep.AppendHeader("Last-Modified", time);
}
httpInfo.Content = _stream;
OutResponse(req, rep, httpInfo);
LogHelp.Info("cache hit html " + req.RawUrl);
}
context.ApplicationInstance.CompleteRequest();
}
/// <summary>
/// 输出http响应header
/// </summary>
/// <param name="rep"></param>
/// <param name="info"></param>
private void OutHeaders(HttpResponse rep, HttpInfo info)
{
foreach (var item in info.Headers)
{
if (alowHeader.Contains(item.Name))
{
rep.AppendHeader(item.Name, item.Value.TrimEnd());
}
}
}
/// <summary>
/// 输出Http流
/// </summary>
/// <param name="rep"></param>
/// <param name="info"></param>
private void OutResponse(HttpRequest req, HttpResponse rep, HttpInfo info)
{
Stream _out = AcceptGzip(req, rep, info);
OutHeaders(rep, info);
OutBody(rep, _out);
}
/// <summary>
/// 根据请求头自动判断客户端是否支持gzip，如果不支持， 在服务器解压
/// </summary>
/// <param name="req"></param>
/// <param name="rep"></param>
/// <param name="info"></param>
/// <returns></returns>
private static Stream AcceptGzip(HttpRequest req, HttpResponse rep, HttpInfo info)
{
var acceptEncoding = req.Headers.Get("Accept-Encoding");
Stream _out;
if (acceptEncoding != null && acceptEncoding.Contains("gzip"))
{
_out = info.Content;
rep.AppendHeader("Content-Encoding", "gzip");
}
else
{
_out = new GZipStream(info.Content, CompressionMode.Decompress);
}
return _out;
}