Fix/configurable user agent #2620
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Fixes #2554
Some external services reject requests made by Cog when fetching input URLs
because the default
python-requestsUser-Agent is blocked or disallowed.Previously, Cog used
requests.get()without any way for users to configurerequest headers. This caused URL fetches to fail for certain providers.
This change allows users to configure the User-Agent via an environment
variable (
COG_USER_AGENT). If the variable is set, it is included in therequest headers; otherwise, the existing behavior remains unchanged.
This provides a simple, backward-compatible way to avoid request rejections
without modifying Cog internals or re-hosting input files.