Failed to retrieve/set file extension when upload file as blob

[creeperyang]

What I upload:

------WebKitFormBoundaryi8ZhzSYa1jK76hJC
Content-Disposition: form-data; name="tags"

56a1f2c06dfc44c4570a46cb,56a1f2c06dfc44c4570a46cc
------WebKitFormBoundaryi8ZhzSYa1jK76hJC
Content-Disposition: form-data; name="headImg"; filename="blob"
Content-Type: image/jpeg

------WebKitFormBoundaryi8ZhzSYa1jK76hJC--

The problem is that when handle File and ouput a Blob instance, and then upload this blob, the filename's extension will lost (client only sent filename="blob").

So the IncomingForm.prototype._fileName will return "blob" as the file.name.

And IncomingForm.prototype._uploadPath will generate path without extension (although this.keepExtensions is true) and all saved files lost their extension.

I'm not sure it's a better way to retrieve and add extension from Content-Type: image/jpeg, or just leave it with no extension.

[art-in]

I'm using chrome (v52) and does not see such effect.

case:

let file = input.files[0];

let data = new FormData();
data.append('photo', photo);

fetch(`url`, {
    method: 'POST',
    body: data
});

request:

------WebKitFormBoundary76WmHIDQOjBC1dKX
Content-Disposition: form-data; name="photo"; filename="___.jpg"
Content-Type: image/jpeg

File name is in place.

[creeperyang]

Um, It's chrome v46/v48 (v40+, not v50+) when I report this issue.

Maybe things changed when chrome updated.

[tunnckoCore]

@creeperyang can you try it and report back when you can?

[zhancheng]

cause this issue, because the third argument does not set formdata.append('blobdata', blob, filename);

[GrosSacASac]

This looks like to be a client side issue