1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
using MediaBrowser.Model.Logging;
using ServiceStack;
using ServiceStack.Web;
using System;
using System.Globalization;
using System.Net;
using System.Text;
namespace MediaBrowser.Server.Implementations.HttpServer
{
public class ResponseFilter
{
private static readonly CultureInfo UsCulture = new CultureInfo("en-US");
private readonly ILogger _logger;
public ResponseFilter(ILogger logger)
{
_logger = logger;
}
/// <summary>
/// Filters the response.
/// </summary>
/// <param name="req">The req.</param>
/// <param name="res">The res.</param>
/// <param name="dto">The dto.</param>
public void FilterResponse(IRequest req, IResponse res, object dto)
{
// Try to prevent compatibility view
res.AddHeader("X-UA-Compatible", "IE=Edge");
var exception = dto as Exception;
if (exception != null)
{
_logger.ErrorException("Error processing request for {0}", exception, req.RawUrl);
if (!string.IsNullOrEmpty(exception.Message))
{
var error = exception.Message.Replace(Environment.NewLine, " ");
error = RemoveControlCharacters(error);
res.AddHeader("X-Application-Error-Code", error);
}
}
if (dto is CompressedResult)
{
// Per Google PageSpeed
// This instructs the proxies to cache two versions of the resource: one compressed, and one uncompressed.
// The correct version of the resource is delivered based on the client request header.
// This is a good choice for applications that are singly homed and depend on public proxies for user locality.
res.AddHeader("Vary", "Accept-Encoding");
}
var hasOptions = dto as IHasOptions;
if (hasOptions != null)
{
// Content length has to be explicitly set on on HttpListenerResponse or it won't be happy
string contentLength;
if (hasOptions.Options.TryGetValue("Content-Length", out contentLength) && !string.IsNullOrEmpty(contentLength))
{
var length = long.Parse(contentLength, UsCulture);
if (length > 0)
{
var response = (HttpListenerResponse)res.OriginalResponse;
response.ContentLength64 = length;
// Disable chunked encoding. Technically this is only needed when using Content-Range, but
// anytime we know the content length there's no need for it
response.SendChunked = false;
}
}
}
}
/// <summary>
/// Removes the control characters.
/// </summary>
/// <param name="inString">The in string.</param>
/// <returns>System.String.</returns>
private static string RemoveControlCharacters(string inString)
{
if (inString == null) return null;
var newString = new StringBuilder();
foreach (var ch in inString)
{
if (!char.IsControl(ch))
{
newString.Append(ch);
}
}
return newString.ToString();
}
}
}
|
