CODEWITHSUNDEEP
c#asp.net-web-apiasp.net-corepostman
Harry
Harry

Reputation: 3937

Postman file and json returns 415 even with Content-Type Header .net core

I am using postman to test my .net core API, when i am trying to post data via postman form-data this returns a 415 even if i set the Content-Type header to application/json as the common solution for this issue appears to be online. If i fire the request without any files via the raw postman option and set the content type as JSON(application/json) this request reaches the API successfully.

Here is how my API looks:

 [HttpPost("{organization}")]
    public IActionResult Post([FromBody] Asset asset, string organization)
    {
       //Api body
       //Get files from request
       Task uploadBlob = BlobFunctions.UploadBlobAsync(_blobContainer,Request.Form.Files[0]);
    }

And here is how the failed postman request looks like enter image description here

and the header for that request

enter image description here

What else am i missing for this to work?

Small update

This works fine if i remove [FromBody]Asset asset and just pass the file

Upvotes: 2

Views: 4208

Answers (2)

Harry
Harry

Reputation: 3937

Turns out that for some weird reason I was not allowed to pass any of them as a variable of my controller but it works if I retrieve both from the Request.

 if (!Request.Form.ContainsKey("asset"))
 {
    return BadRequest("Asset cannot be empty");
 }
 Asset asset = JsonConvert.DeserializeObject<Asset>(Request.Form.First(a => a.Key == "asset").Value);

and for the file 

var file = equest.Form.Files[0]

Not sure why this is the case and would appreciate if someone could explain this to me but this seems to solve my issue.

Upvotes: 0

Omar Beyhum
Omar Beyhum

Reputation: 557

Try using the [FromForm] attribute instead of the [FromBody] attribute:

 [HttpPost("{organization}")]
    public IActionResult Post([FromForm] string asset, string organization, IFormFile fileToPost)
    {
       //Api body
       Asset asset = JsonConvert.DeserializeObject<Asset>(asset);
       //Get files from request
       Task uploadBlob = BlobFunctions.UploadBlobAsync(_blobContainer, fileToPost);
    }

I can't say for sure, but my guess is that in postman, since you're making a form-data request, your content-type would end up being "multipart/form-data" (if you debug the request when it is being processed, you can see that the content type changes to multipart even though you set it to application/json).  

But in your Controller's POST action you specify that you expect an Asset object from the body (which expects a JSON object by default). So you get a 415 since your request's content type is multipart while your API expects application/json because you used the [FromBody] attribute.

Upvotes: 4

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