Gzip / Brotli not applied as expected

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Gzip / Brotli not applied as expected

sebp

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After upgrading a client's solution to Optimizely 12 we are trying to apply brotli / gzip compression to api calls on the site, search for instance.

In my startup.cs I've applied the following:

... in ConfigureServices:

...and in Configure:

But when checking the Response Headers for a search api call made, it show nothing about compression whatsoever for Response:

Is there something more I need to do in order for it to be applied?

#298914

Edited, Mar 24, 2023 12:39

Eric Herlitz

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You must enable https

services.AddResponseCompression(options =>
{
    options.Providers.Add<BrotliCompressionProvider>();
    options.Providers.Add<GzipCompressionProvider>();
    options.MimeTypes = ResponseCompressionDefaults.MimeTypes.Concat(new[] { "application/json" });
    options.EnableForHttps = true; // 👈🏻👈🏻👈🏻👈🏻
});

#298916

Mar 24, 2023 12:52

sebp

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I've added this now. However I still get the same result after restarting the site numerous times to make sure it was applied.

This is one of the calls that I expect to have the compression, are there any issues here?

#298924

Edited, Mar 24, 2023 14:05

Eric Herlitz

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What mimetype does that API respond with?

#298927

Mar 24, 2023 18:44

Stefan Holm Olsen

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Hi sebp

Can you confirm that UseResponseCompression is among the first lines of the Configure method? It has to come before any middleware that can produce a response, because the response is streamed back through a chain of middleware.

PS. "application/json" is already included in the default list. So that is not needed in your configuration.

#298928

Mar 24, 2023 19:11

sebp - Mar 27, 2023 7:31

Thank you Stefan, this was indeed the problem. I tried moving it further up the Configure-method, and that did the trick. I also tried removing the application/json-specification as you suggested and it seems to be working fine without that as well.

Cheers!

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