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lukaszraczylo
304c5ebf3f
Hoist the Upgrade->501 and traversal->400 checks in handleTargetProxy
above checkAndCount, matching handlePassthrough's own order
(403 -> 501 -> 400 -> limit). A request rejected before the upstream
call must never burn the caller's or their group's rate-limit quota
for a call that was never going to reach the target. Updated the
function's doc comment to state and justify the order.
Add TestHandleTargetProxy_RateLimited_Returns429WithRetryAfter:
group requestsPerMinute:1, two hits on /mcp/{name}/x -> first 200,
second 429 with Retry-After, upstream called exactly once.
Add TestHandleTargetProxy_JSONResponse_OnlyRequestCounterMoves: a
usage-shaped JSON response from the target leaves token/cost
counters at 0 while the request-rate counter moves to 1, proving
the target proxy never tees or accounts a response the way native
passthrough does.