SC-190481 bug: proxy-headers CORS pre-flight response

[tidbit1]

Summary by Sourcery

Fix proxyFetch to omit custom headers for OPTIONS requests and refactor header assembly to handle all methods consistently

Bug Fixes:

• Exclude X-Proxy-Headers from proxy requests when the HTTP method is OPTIONS to support CORS preflight

Enhancements:

• Derive the outgoing HTTP method and URL dynamically and centralize the proxy header construction in proxyFetch

[sourcery-ai]

Reviewer's Guide

Refactors proxyFetch to introduce explicit method detection, separate header construction, and conditional inclusion of original request headers to prevent CORS pre-flight failures for OPTIONS requests.

Flow diagram for conditional header logic in proxyFetch

flowchart TD
    A[Start proxyFetch] --> B{Is input a string?}
    B -- Yes --> C[method = init?.method or 'GET']
    B -- No --> D[method = input.method]
    C --> E{Is method OPTIONS?}
    D --> E
    E -- Yes --> F[Do not set X-Proxy-Headers]
    E -- No --> G[Set X-Proxy-Headers]
    F --> H[Set other proxy headers]
    G --> H
    H --> I[Call fetch with POST and constructed headers]

Loading

File-Level Changes

Change	Details	Files
Conditional omission of X-Proxy-Headers on OPTIONS requests	Check if the HTTP method is OPTIONS before adding X-Proxy-Headers Only stringify and attach init.headers when method is not OPTIONS	src/proxy/helpers.ts
Refactor header construction and method resolution	Introduced a local method variable derived from input or init.method Initialized headers object separately with authorization, URL, and method fields Updated fetch call to spread init and use the new headers object	src/proxy/helpers.ts

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