SignatureDoesNotMatch when supplying content_type

[Brianvdb]

json
|> GcsSigner.Client.from_keyfile
|> GcsSigner.sign_url(object.bucket, object.name, expires: 7826133600, content_type: "image/*")

This generates an URL as expected. But when navigating to it I receive the following error:

<Error>
<Code>SignatureDoesNotMatch</Code>
<Message>
The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.
</Message>
<StringToSign>
.... etc....
</StringToSign>
</Error>

When i remove the content_type opt it works as expected. What is going wrong?

[premist]

@Brianvdb Hello there, thanks for your issue and sorry I couldn't reply sooner.

Currently I'm not actively working on Elixir-based projects, so it may be later that I will be able to allocate some time and investigate this.

I wonder if "image/*" is the culprit — so far I only used the exact match on Content-Type header like image/jpg so don't have an experience with working on Content-Type specification with wildcard.

Have you tried using exact Content-Type and experienced similar issue?