How to add "Content-Type = application/json;v=2.0" including versioning with HttpClient?

2
votes

Sorry to ask this question like this. I can give you the feeling I would like you to do the code for me. I already spent a day tying to write the code to send a http request that contains a header with versioning:

For versioning I use the versioning by Media Type from Microsoft/aspnet-api-versioning project.

My API part is working fine and I can request the correct version without problem with Postman:

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You see this line "Content-Type = application/json;v=2.0"? On postman no problem. With HttpClient from C# impossible to do.

Let me copy pas here all solution I tried with they error. I will Edit this question each time I try a new solution. By facility, but also to be more clear I will copy paste images:

Solution 1: The extension method with new Content = ...

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Solution 1B: From BeginnerTejas

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Solution 1C: From BeginnerTejas but using MediaTypeWithQualityHeaderValue now

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Solution 2: The extension method with request.Headers.Add(...)

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Solution 3: BaseProxy with Client.DefaultRequestHeaders.TryAddWithoutValidation(...) It seems I cannot add any "Content-Type"

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Solution 4: BaseProxy with Client.DefaultRequestHeaders.Accept.Add(...)

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Solution 5: request.Headers.TryAddWithoutValidation("Content-Type", "application/json");

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2
c#.netasp.net-web-api2aspnet-api-versioning
have you tried ApiVersion attribute? - priyadarshi swain
ApiVersion attribute is for Server side. Yes all my API use the [ControllerName("Client")] then [ApiVersion("2.0")] similar settings. Again, server is working fine. I can send all my requests from Postman. Problem is how to add a header with HttpClient? - Bastien Vandamme
Any solution to this? - ronconsoda

2 Answers

1
votes

Can you try this?

request.Content.Headers.ContentType = new MediaTypeWithQualityHeaderValue( "application/json" )
{
    Parameters = { new NameValueHeaderValue( "v", "2.0" ) }
};
0
votes

You can't (or at least shouldn't) use Content-Type when you don't send any content. Use the Accept header for GET and DELETE requests like this:

request.Headers.Accept.Add(MediaTypeWithQualityHeaderValue.Parse("application/json; v=2.0"));

If both headers are specified Content-Type is considered before Accept. If Accept specifies multiple media types with a version, the one with the highest quality is matched. Mixing versions per request (e.g. send 2.0, but receive 1.0) is not supported. Negotiating multiple media types with a version is also not currently supported (aside from quality).