/// <summary>
/// Overrides the default order of compression from Smidge, since Brotli is super slow (~10 seconds for backoffice.js)
/// </summary>
/// <param name="headers"></param>
/// <returns></returns>
public CompressionType GetClientCompression(IDictionary <string, StringValues> headers)
{
CompressionType type = CompressionType.None;
if (headers is not IHeaderDictionary headerDictionary)
{
headerDictionary = new HeaderDictionary(headers.Count);
foreach ((var key, StringValues stringValues) in headers)
{
headerDictionary[key] = stringValues;
}
}
var acceptEncoding = headerDictionary.GetCommaSeparatedValues(HeaderNames.AcceptEncoding);
if (acceptEncoding.Length > 0)
{
// Prefer in order: GZip, Deflate, Brotli.
for (var i = 0; i < acceptEncoding.Length; i++)
{
var encoding = acceptEncoding[i].Trim();
var parsed = CompressionType.Parse(encoding);
// Not pack200-gzip.
if (parsed == CompressionType.GZip)
{
return(CompressionType.GZip);
}
if (parsed == CompressionType.Deflate)
{
type = CompressionType.Deflate;
}
// Brotli is typically last in the accept encoding header.
if (type != CompressionType.Deflate && parsed == CompressionType.Brotli)
{
type = CompressionType.Brotli;
}
}
}
return(type);
}