Will the request headers be overwritten?

[fonnebien]

Hi,

When I have a ky instance where the "Content-Type" header is, by default, set to "application/json", will it automatically update the same header to "multipart/form-data" when I send formData in a request with the same instance?

I have read the docs but that use case was not so clear to me.
Thanks in advance for any help!

Kind regards

[sindresorhus]

Yes, when you send FormData in a request, Ky automatically removes any default Content-Type header (including your instance's application/json), allowing the browser to set the correct multipart/form-data header with the proper boundary.

[fonnebien]

Thank you for the quick response!

[sholladay]

What's your use case for setting the content type on the instance? Ky sets that header automatically.

[fonnebien]

@sholladay Force of habit, that's all 😄