I have created a new formatter in order to handle content negotiation.
public TiffImageFormatter()
{
SupportedMediaTypes.Add(new MediaTypeHeaderValue("image/tiff"));
}
public override bool CanReadType(Type type)
{
return type == typeof(byte[]);
}
public override bool CanWriteType(Type type)
{
return type == typeof(byte[]);
}
But when running
var negotiator = Configuration.Services.GetContentNegotiator();
var type = negotiator.Negotiate(typeof(byte[]), Request, Configuration.Formatters);
The supported media types are not taken into consideration instead "CanWritetype" is the only condition determining what accept type to use.
Accept: image/*, image/png, image/tiff, */* should result in image/tiff but Accept: image/png should return in null allowing me to send not acceptable.
How can I determine which is the correct media type?
You need to use MediaTypeFormatter.MediaTypeMappings and add the relevant Accept headers:
public TiffImageFormatter()
{
SupportedMediaTypes.Add(new MediaTypeHeaderValue("image/tiff"));
MediaTypeMappings.Add(
new RequestHeaderMapping("Accept", "image\tiff",
StringComparison.OrdinalIgnoreCase,
false, "image\tiff"));
}
This blog post explains the algorithm for media type matching if you need any further information.
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