Added mode, credentials, redirect, and cache options to the GET fetchOptions
object. These were previously left to browser defaults, which vary by environment
and can produce opaque CORS failures that are hard to diagnose. Being explicit
avoids environment-dependent surprises.
Also added a try/catch around response.headers logging (log_lvl >= 1) so header
dumps don't throw in environments that restrict header access.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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