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I’m seeing the same issue as #416 - downloaded page is gzip encoded and AngleSharp is not decompressing it.

Steps to Reproduce

Does not work:

var config = Configuration.Default.WithLocaleBasedEncoding().WithDefaultLoader();
var address = "";
var context = BrowsingContext.New(config);
var document = await context.OpenAsync(address);

Expected behavior: [What you expected to happen]

Document should be decompressed plain text.

Actual behavior:

Document is “garbled” gzipped content.

Environment details: [OS, .NET Runtime, …]

Windows 11 x64, .NET 7.0.302, AngleSharp 1.0.3

Possible Solution


HttpClientHandler handler = new HttpClientHandler()
    AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
var http = new HttpClient(handler);
var body = await http.GetStringAsync("");

var config = Configuration.Default;
var context = BrowsingContext.New(config);
var document = await context.OpenAsync(req => req.Content(body));

Working around this by using HTTP Client. Is this the recommended approach? I searched for “org:AngleSharp gzip” and didn’t see any recommendations or FAQ guidance. I assume this should be out-of-box automatic behavior, so maybe I’m missing something.

Issue Analytics

  • State:closed
  • Created 3 months ago
  • Comments:5 (4 by maintainers)

github_iconTop GitHub Comments

FlorianRapplcommented, Jun 24, 2023

By the way I could finally reproduce this. The server is sometimes returning Brotli (“br”) compressed responses - even though the Accept-Encoding header tells it that only “deflate” and “gzip” are supported.

In such case we’ll now throw an exception. The response would have been gibberish anyway and this way one can react. Should be a rare case though - this is certainly a problem on the webserver.

FlorianRapplcommented, Jun 14, 2023

Working around this by using HTTP Client. Is this the recommended approach?

Yes, the requester coming with AngleSharp is not using the HttpClient and should only be used in simple cases. If you heavily rely on IO then you should use AngleSharp.Io.

I’ll see if this is a general problem with the requester (not being able to process gzip) or if this is something with the page. If its a general problem then we need to drop the “gzip” from accepted encodings.

Read more comments on GitHub >

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