Function performOutbound

performOutbound(
    site: SitePhpDurableObject,
    url: string,
    method: string,
    body: string,
    headers: Record<string, string>,
): Promise<TcpResult>
One outbound exchange, with no SQL in it.

Split out so the drain can hold several open at once. The TCP and AI tiers share this queue, cache and budget on purpose, so dedup, TTL and attempt budget live in one place.
Parameters
- site: SitePhpDurableObject
- url: string
- method: string
- body: string
- headers: Record<string, string>
Returns Promise<TcpResult>
- Defined in src/do/outbound.ts:232