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/home/byk/Code/opencode-lore-v2/packages/gateway/src/pipeline.ts defines ResolvedRequestUpstreamRoute with providerHeader?, selected providerID?, headerUpstream?, headerUpstreamPath?, providerRoute, modelRoute, effectiveProtocol, effectiveUpstreamBase, and bedrockMantle.captureLegacyGlobalAuth() preserves the legacy process-global credential only for a local, unambiguous direct-provider request routed to the exact configured base. Remote/hosted gateways, explicit x-lore-provider selection, and client-selected x-lore-upstream-url values never populate it.captureLegacyGlobalAuth() returns undefined when usesRemoteSessionBinding(config) is true, when x-lore-provider or x-lore-upstream-url is present, when the effective protocol is neither anthropic nor openai/openai-responses, or when normalized effective and configured upstream bases differ. It calls setLastSeenAuth(cred, providerID) only after all guards pass.resolveRequestUpstreamRoute() is the synchronous single source of truth for foreground routing and its durable snapshot; dynamic models.dev lookup is cache-only so route intent can be captured before fetch/interception and retained even when forwarding fails.resolveRequestUpstreamRoute() validates x-lore-provider with extractProviderHeader() and throws Unsupported or invalid X-Lore-Provider when the raw header exists but sanitization fails. It similarly throws Invalid X-Lore-Upstream-URL when a raw upstream URL header exists but extractUpstreamUrlHeader() rejects it.isCallerUpstreamAllowed() or routing throws X-Lore-Upstream-URL origin is not allowed by this remote gateway.resolveProviderRoute(providerID), then cache-only lookupProviderRoute(providerID, false); an unknown untrusted provider fails closed without side-channel network activity.providerID = "github-copilot" and resolves that provider route.extractAuth(req.rawHeaders) to succeed or routing throws An explicit upstream URL requires client authentication.isUpstreamWithinBase() and throws Explicit upstream path escapes its upstream base if the path escapes.Unsupported provider "${providerID}" when an explicit provider has neither a known provider route nor an explicit upstream. It throws Provider "${providerID}" requires an explicit upstream URL when the provider route lacks a URL and is not a self-building Vertex or Bedrock Mantle route.openai-responses and gemini ingress, an explicitly selected Anthropic provider can override the effective protocol to anthropic; otherwise those ingress protocols remain unchanged. Other requests choose the first available protocol from usable provider route, model route, then req.protocol.headerUpstream; 2. self-built Bedrock Mantle or Vertex URL; 3. providerRoute?.url; 4. modelRoute?.url; 5. protocol default—config.upstreamAnthropic, GEMINI_DEFAULT_UPSTREAM, or config.upstreamOpenAI.bedrockMantleUrl(config.bedrockRegion); Vertex uses https://${vertexHost(config.vertexRegion)}.UpstreamResult contains the raw response, exact serializedBody sent upstream for cache analytics, and an effectiveProtocol of "anthropic", "openai", "openai-responses", "vertex", or "gemini".forwardToUpstream() accepts optional UpstreamInterceptor, AnthropicCacheOptions, AbortSignal, and pre-resolved ResolvedRequestUpstreamRoute; when no route is supplied it calls resolveRequestUpstreamRoute(req, config).forwardToUpstream() logs the effective upstream together with provider, providerURL, modelRoute, whether headerUpstream is present, effective protocol, and auth scheme. It also emits an error when a gho_ bearer token is routed to an upstream whose base does not contain githubcopilot.LORE_UPSTREAM_${providerID.toUpperCase().replace(/-/g, "_")}=<url> when a selected provider route has no URL, explicit upstream, or model route and would fall through to a default.systemTTL: "5m" and conversationTTL: "5m"; native https://api.anthropic.com retains the supplied cache configuration.model via toMantleModelId(req.model) to the anthropic.<model> catalog form. req.model remains the original client model ID for session and cache tracking.verbatimUpstreamUrl() applies preserved x-lore-upstream-path only for pure passthrough: headerUpstream is the effective base and ingress and effective wire protocols match. This supports GitHub Copilot /chat/completions and non-standard prefixes while excluding Vertex, Bedrock, and translated requests.applyUpstreamExtraHeaders(headers, extraHeadersForUpstream(config, url)) runs as the final header overlay, intentionally allowing trusted LORE_UPSTREAM_EXTRA_HEADERS to override reconstructed x-api-key or Authorization for corporate proxies, LiteLLM team routing, Cloudflare AI Gateway authentication, and service-account scenarios.effectiveProtocol === "anthropic" && hasBillingHeader(req.system), rather than the broader Claude Code size heuristic isClaudeCodeClient(...) || hasBillingHeader(...).resignBody ran for all Anthropic-protocol turns, including API-key sessions whose content merely quoted the billing sentinel while editing files such as cch.ts or cch.test.ts; content matching rewrote the quoted cch each turn, busted the prompt cache, and triggered verifyBillingHeaderUnique.^-anchored BILLING_HEADER_RE match in system[0] before re-signing; without an embedded header there is nothing to sign, making the prior OR-form heuristic incorrect./home/byk/Code/opencode-lore-v2/packages/gateway/src/auth.ts extractAuth() accepts exactly one recognized mechanism: valid non-whitespace x-api-key, valid non-whitespace x-goog-api-key, or case-insensitive Authorization: Bearer <non-whitespace-token>. It returns null for no valid credential or conflicting mechanisms.x-goog-api-key is represented internally as { scheme: "api-key", value } so Gemini sessions receive stable identity and background workers can resolve auth; Gemini worker builders later emit x-goog-api-key, not generic x-api-key.hasConflictingAuthHeaders() matches recognized auth header names case-insensitively and treats mere presence of more than one mechanism as ambiguous, even if values are empty or byte-identical.copyProviderAuthHeaders() returns {} for absent or conflicting headers; otherwise it copies the single provider-auth variant without changing its header scheme.authHeaders() maps "api-key" to { "x-api-key": cred.value } and "bearer" to { Authorization: \Bearer ${cred.value}` }`.credentialTenantFingerprint() with the full SHA-256 output.