s3 config with use_accelerate_endpoint and generate_presigned_post does not work

[jnoring]

This code:

    s3 = boto3.client('s3', config=Config(s3={'use_accelerate_endpoint': True}))
    s3.generate_presigned_post(
        Bucket = 'some bucket,
        Key = 'some key'
    )

...will not result in an accelerated URL being generated for a presigned post operation. The bug is in this code, in client.py:

        # Enable accelerate if the configuration is set to to true or the
        # endpoint being used matches one of the Accelerate endpoints.
        if s3_accelerate or S3_ACCELERATE_ENDPOINT in self._endpoint.host:
            # Amazon S3 accelerate is being used then always use the virtual
            # style of addressing because it is required.
            self._force_virtual_style_s3_addressing()
            # Also make sure that the hostname gets switched to
            # s3-accelerate.amazonaws.com
            self.meta.events.register_first(
                'request-created.s3', switch_host_s3_accelerate)

...request-created.s3 is never called for a presigned post because no request to s3 is made, and thus switch_host_s3_accelerate is not called.

[kyleknap]

I can confirm. That looks to be the issue as well.

[kevinbui001]

Has this been fixed?

[johnd08]

Issue is still there in version 1.4.4 - are there any plans to fix this?

[joshma]

It's been 16 months, has anyone found a fix or workaround? Looks like url.replace(S3_HOST, 's3-accelerate') works, but that's pretty hacky.