Add custom request headers

[glonlas]

Is your feature request related to a problem? Please describe.
Botocore seems to not support custom headers yet. For some application we will need additional headers like X-Amz-Date, Accept-Encoding, Connection, and so on.

Describe the solution you'd like
I would like to propose a pull-request adding to extend JSONSerializer#serialize_to_request with the ability to receive custom headers via a Serializer attribute (Dict) we can customize. So applications using Botocore can decide what additional headers they want/need.

This will increase Botocore's flexibility.

Is there any concern about such a new feature?

[swetashre]

@glonlas - Thank you for your post. Marking this as feature request.

Currently you can inject custom headers to an api call by registering it with boto3 events. Here is the link to the documentation with example:
https://boto3.amazonaws.com/v1/documentation/api/latest/guide/events.html

Hope it helps.

[github-actions]

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[Frederik-Baetens]

Hi, I'd like to have this feature request re-opened as it is indeed possible to add headers to a request, but I want to set a different header with each call, which I don't think is possible as of now with the current extensibility mechanism.

I.e. It seems to be possible to register a handler to an event, but I haven't found a way to pass extra information to this handler at runtime upon each invocation.

[mullenkamp]

Yes, this would be very useful. Unfortunately, this issue got passed off from boto/boto3#2889 (with quite a bit of interest) then died here...