custom-host in header overwrites custom_host in config.providers.custom_host in fallback mode

[villageFlower]

What Happened?

Hi, the custom_host in config providers does not work when given x-portkey-custom-host in request headers. All fallback providers tends to use the one given in x-portkey-custom-host instead of the one in x-portkey-config. Thank you for the project and feel free to approch me for more details

What Should Have Happened?

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Relevant Code Snippet

below is the demo config file. Eventhough custom_host is specified. It still goes to x-portkey-custom-host { "strategy": { "mode": "fallback" }, "targets": [ { "provider": "openai", "api_key": "OPENAI_API_KEY_FROM_HOST_2","custom_host":"HOST_1" }, { "provider": "openai", "api_key": "OPENAI_API_KEY_FROM_HOST_2","custom_host":"HOST_2" } ] }

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