Capabilities

For operators comparing what the titanium CLI and its optional Plus add-on cover. Every row links to the website page that explains it. The same table is on the website.

Status: supported works as described. partial works with the limits named in Notes. not supported is not offered; Notes gives the reason and what to use instead.

Config key: a key in twp.yaml, written the way the schema nests it (routes[] is a list entry). A key with a prefix such as plus.options: is a Titanium Plus option, which is a free-form string key. A row with a command, an API path, or a resource name has no twp.yaml key; the cell says what to use. — means there is nothing to set.

Routing

Capability	Status	Config key	Notes	Docs
Match on host, path, method, header, and query, with order and specificity	supported	routes[].match.hosts, routes[].match.path, routes[].match.pathKind, routes[].order	Exact, segment prefix, prefix, template, and regex paths. A lower order wins; ties go to the more specific match.	Configuration
Redirects, direct responses, and custom error pages	supported	routes[].redirect, routes[].directResponse, routes[].errorPages	Answer from the proxy without an origin, or replace the body of a generated status.	Configuration
Weighted traffic split across clusters	supported	routes[].clusters	A route lists clusters with weights; a cookie or header can pin a client to one of them.	Configuration
Request mirroring	supported	routes[].mirror	Sends a sampled copy of matching requests to another cluster and discards the answer. Large bodies are skipped.	Configuration
Request and response rewrites	supported	routes[].transforms	Path prefix, query, and header edits on the way to the origin; response header edits on the way back.	Route transforms
Static files	supported	staticFiles	Serves a directory, with optional gzip and brotli.	Static files

Load balancing

Capability	Status	Config key	Notes	Docs
Balancing algorithms	supported	clusters[].algorithm	RoundRobin, Random, LeastRequests, and LeastTime.	Configuration
Weights, priority, backup destinations, and slow start	supported	clusters[].destinations[].weight, clusters[].destinations[].priority, clusters[].destinations[].backup, clusters[].slowStartSeconds	Slow start ramps a new destination from 10 percent of its weight.	Configuration
Session affinity by cookie, header, or hash	supported	clusters[].sessionAffinity, clusters[].hashKey	An opaque affinity cookie, a sticky header, or consistent hashing on a chosen key.	Configuration
Concurrency caps and a wait queue	supported	clusters[].destinations[].maxConcurrentRequests, clusters[].queue	The queue waits briefly when every destination is at its cap.	Configuration
Service discovery	partial	plus.options: discovery.*	Plus watches a file, polls DNS (A/AAAA or SRV), and queries Consul or Kubernetes EndpointSlices. Consul and Kubernetes discovery are best-effort.	Plus

Health checks

Capability	Status	Config key	Notes	Docs
Passive ejection	supported	clusters[].healthCheck.passive	Treats 502, 503, and 504 as failures by default, caps the share ejected, and sends one trial after reactivateAfterSeconds.	Configuration
Active probes	supported	clusters[].healthCheck.active	Requires plus.enabled. Prefer plus.options resilience.activeHealth for the full Plus resilience path; titanium test rejects healthCheck.active without Plus.	Plus
Probe endpoints for orchestrators	supported	server.admin	/healthz and /readyz on a port no proxy listener shares. Readiness turns 503 on SIGTERM before the drain starts.	Admin listener
Drain and maintenance states	supported	plus.controlPlane	An operator drains a destination from the dashboard or the control-plane API (Plus).	Plus

Retries and budgets

Capability	Status	Config key	Notes	Docs
Connect failover to the next destination	supported	routes[].retry.attempts, clusters[].retry.attempts	Idempotent methods by default.	Configuration
Gateway-status replay with backoff and jitter	supported	routes[].retry.statusCodes, routes[].retry.backoffMilliseconds, routes[].retry.jitterPercent, routes[].retry.honorRetryAfter	Replays a 502, 503, or 504 onto another destination before anything reaches the client.	Configuration
Retry budget	supported	routes[].retry.budgetPercent, routes[].retry.budgetMinConcurrent	Limits replays in flight to a share of the cluster's in-flight requests. Refused replays are counted.	Configuration
Per-try timeout	supported	routes[].retry.perTryTimeoutMilliseconds	Ends a slow try as a 504 on every try but the last.	Configuration
Retry of requests with a body	partial	routes[].retry.retryNonIdempotent, routes[].retry.maxBufferedBodyBytes	Only a body that was fully buffered is replayed. An HTTP/3 client talking to an HTTP/2 origin is not retried.	Protocol support

Timeouts

Capability	Status	Config key	Notes	Docs
Connect, header, idle, and request timeouts	supported	server.timeouts.connectTimeOutSeconds, server.timeouts.clientHeaderTimeoutSeconds, server.timeouts.responseHeaderTimeoutSeconds, server.timeouts.idleReadTimeoutSeconds, server.timeouts.requestTimeoutSeconds	Zero turns a timeout off.	Server reference
Per-route timeout and buffer overrides	supported	routes[].limits.requestTimeoutSeconds, routes[].limits.idleTimeoutSeconds, routes[].limits.maxBufferedBodyBytes	A route overrides the server limits for its own sessions.	Limits
Drain on shutdown	supported	server.admin.preStopDelaySeconds	Keeps serving for the delay after /readyz flips, then drains in-flight requests.	Kubernetes

Rate limiting

Capability	Status	Config key	Notes	Docs
Request rate limit per key	supported	policies[].key, policies[].algorithm, policies[].limit, policies[].windowSeconds, policies[].burst	Fixed window or token bucket, keyed by client, forwarded client, header, cookie, or route. Answers 429 with Retry-After.	Configuration
Concurrent connection caps	supported	listeners[].maxConcurrentClients, server.limits.maxConcurrentClients	Admission control per listener or for the whole server.	Limits
Rate limit shared across instances	supported	policies[].scope, policies[].fleetFailMode, policies[].localShare, plus.options: state.mode, plus.options: state.redis	Requires plus.enabled. Leased fleet token bucket over Redis; the request path stays sync. Default scope node is unchanged.	Configuration

Auth methods

Capability	Status	Config key	Notes	Docs
Required header and API key checks	supported	policies[].headerName, policies[].headerValue	The requireHeader and apiKey policy kinds refuse a request that lacks the header or value.	Configuration
External authorization service	supported	policies[].url, policies[].failOpen, policies[].cacheSeconds	An HTTP service allows or denies each request. Redirects are not followed, and a short positive cache is optional.	Configuration
OpenID Connect login	supported	policies[].issuer, policies[].clientId	Authorization-code flow with PKCE and an encrypted session cookie (Plus).	Login policy
JWT, API key, and Basic authentication	supported	plus.options: security.*	JWKS-verified JWT, API keys, and Basic users with bcrypt or PBKDF2 hashes (Plus).	Plus
Address allow and deny lists	supported	policies[].allow, policies[].deny	IPv4 and IPv6 addresses and CIDR prefixes.	Configuration
Kerberos and NTLM to upstream proxies	partial	server.enableWinAuth	Switch is in the file; credential and proxy-auth callbacks are set in .NET code.	Code-only callbacks
Multi-user dashboard accounts	supported	plus.controlPlane.dashboardUsersFile	Per-person operator and viewer accounts from a local users file (PBKDF2 hashes). Shared secrets remain as optional break-glass.	Plus
SSO beyond the OIDC login policy	supported	plus.options: controlPlane.dashboardOidc.*	Plus dashboard OpenID Connect (authorization code + PKCE), with group and email allow-lists for operator and viewer roles.	Plus

mTLS

Capability	Status	Config key	Notes	Docs
Client certificate to the origin	supported	clusters[].httpClient.clientCertificatePath, clusters[].httpClient.clientCertificateKeyPath, clusters[].httpClient.clientCertificatePasswordEnv	PEM pair or PFX per cluster. The password comes from an environment variable, never the file.	Upstream TLS
Private CA, SNI override, and hostname policy for an origin	supported	clusters[].httpClient.caBundlePath, clusters[].httpClient.serverName, clusters[].httpClient.verifyHostname	The bundle replaces the machine trust store for that cluster.	Upstream TLS
Client certificates from callers	supported	listeners[].clientCertificateMode, listeners[].clientCertificateCaPath	Mode is none, allow, or require, checked against the CA file you name.	Features

TLS policy

Capability	Status	Config key	Notes	Docs
Minimum TLS version and OCSP stapling for listeners	supported	server.tls.minVersion, server.tls.ocspStapling	Applies to the handshake with clients; origin-facing handshakes are not changed.	Listener TLS policy
Cipher suite list for listeners	partial	server.tls.cipherSuites	Linux and macOS only. On Windows .NET has no cipher suite policy, the list is ignored, and validation prints a warning.	Listener TLS policy
Automatic certificates (ACME)	supported	certificates.acmeDomain, certificates.acmeEmail, certificates.acmeDirectory	Obtains certificates from Let's Encrypt or another ACME directory.	Certificates and ACME
0-RTT (early data)	not supported	—	System.Net.Quic does not offer early data, so every QUIC connection starts with a full 1-RTT handshake.	HTTP/3

Caching

Capability	Status	Config key	Notes	Docs
Shared response cache	supported	plus.options: cache.enable, plus.options: cache.maxBytes	Requires plus.enabled with cache.enable. In-memory RFC 9111 subset with Vary, revalidation, size limits, and request collapsing.	Response cache
Cache purge	supported	plus.controlPlane	By exact key or prefix through the control plane at /v1/cache/purge (Plus).	Response cache

Compression

Capability	Status	Config key	Notes	Docs
Response compression (gzip, brotli, optional zstd)	partial	server.responseCompression, routes[].compression	Buffered or streaming on HTTP/1.1 clients, HTTP/2 clients, and HTTP/3 clients across H1/H2/H3 origin bridges when interception is on. Optional zstd is registered by the CLI when listed in algorithms. Fast-path passthrough stays identity.	Response compression
Request decompression with size and ratio limits	supported	server.requestDecompression	gzip and brotli request bodies on HTTP/1.x, with a decompressed-size cap and a zip-bomb ratio limit.	Request decompression

WAF

Capability	Status	Config key	Notes	Docs
Signature screening with detect mode and anomaly scoring	supported	policies[].mode, policies[].paranoiaLevel, policies[].blockThreshold	Built-in rule pack, per-route override, and an operator deny-list (Plus).	Request screening
Custom rules	supported	plus.options: waf.rulesFile	Your own YAML rules next to the built-in pack.	Plus
Geo country allow and deny	supported	policies[].kind, policies[].allow, policies[].deny, server.geoIpDatabasePath	Requires plus.enabled. Country codes from an operator-supplied MaxMind DB. Unknown countries fail closed on allow lists and pass on deny-only lists.	Geo route policy

Observability

Capability	Status	Config key	Notes	Docs
Prometheus metrics	supported	server.metrics	Text exposition of the core meter with bounded label sets.	Prometheus metrics
Traces and metrics export over OTLP	supported	server.telemetry	W3C trace context through the proxy. The OTEL_* environment variables set the defaults.	Telemetry
Access log	supported	server.accessLog, server.requestId	Opt-in NDJSON written after each response, with sampling. Bodies are never buffered for it.	Access log
Read-only dashboard	supported	plus.controlPlane.dashboardPort	Overview, routes and clusters, health, config, certificates, and audit views (Plus).	Plus
Dashboard route editing	supported	plus.controlPlane.dashboardEditing, plus.controlPlane.overlayPath, plus.controlPlane.snapshotValidation	Operators add, edit and delete routes and clusters in a JSON editor with Validate, Save and Delete. Edits are validated, applied live, persisted in an overlay and audited; the overlay can be cleared. The snapshot PUT is validated too.	Plus
Overload protection	supported	server.overload.enabled, server.overload.heapPercent, server.overload.threadPoolQueue, server.overload.activeConnections, server.overload.actions	Off by default. Samples heap, thread-pool queue, and active connections with hysteresis; sheds keep-alives and new requests at elevated/critical. Nearly free when not triggered.	Overload protection

Kubernetes

Capability	Status	Config key	Notes	Docs
Helm chart for the proxy	supported	deploy/helm/titanium	Config, probes, a disruption budget, autoscaling, ServiceMonitor, and a sample NetworkPolicy.	Kubernetes
Hardened container image	supported	ghcr.io/justcoding121/titanium-web-proxy	Chiseled base, non-root, read-only root filesystem, linux/amd64 and linux/arm64. It has no libmsquic, so HTTP/3 is off.	Kubernetes
ConfigMap and Secret reload	supported	titanium run --watch	Follows the atomic ..data swap and reloads once. A reload that fails validation keeps the running config.	Kubernetes
Gateway API HTTPRoute	partial	GatewayClass titanium	HTTP core of the standard channel. A rule the controller cannot honor answers 500 and says why in the route status.	Gateway API
Ingress	supported	networking.k8s.io/v1 Ingress	Served by the same controller, with titanium.io annotations for rewrites and canary.	Ingress
Gateway API TLSRoute, TCPRoute, UDPRoute, and BackendTLSPolicy	supported	TLSRoute, TCPRoute, UDPRoute, BackendTLSPolicy, backendTLSPolicy.enabled	Optional informers tolerate a missing CRD. BackendTLSPolicy ConfigMap RBAC is behind backendTLSPolicy.enabled (default false). GRPCRoute is also translated.	Gateway API
Hot binary upgrade	partial	server.hotRestart.enabled, listeners ReusePort	Linux only: SO_REUSEPORT plus a pid-file and SIGUSR2 handover (the new process signals the old one, which closes its TCP listeners, drains and exits); titanium restart starts the successor and waits for the handover. HTTP/3 and UDP listeners cannot be shared, so they bind after the old process exits and are unavailable for that short gap. Prefer rolling pods behind readiness drain.	Kubernetes

Protocols

Capability	Status	Config key	Notes	Docs
HTTP/1.1 and HTTP/2	supported	server.enableHttp2, listeners[].enableHttp2	HTTP/2 is on by default.	Protocol support
HTTP/3 over QUIC	supported	server.enableHttp3, listeners[].enableHttp3	On when QUIC is available. The container image has no libmsquic.	HTTP/3
Bridging between HTTP versions	supported	server.originHttpVersionPolicy	HTTP/1.1, HTTP/2, and HTTP/3 clients reach origins that speak another version. Not every bridge covers every feature.	Protocol support
WebSocket over HTTP/1.1 and HTTP/2	supported	server.enableRfc8441	HTTP/1.1 upgrade always; RFC 8441 extended CONNECT when enabled.	Protocol support
gRPC-Web to native gRPC	supported	routes[].grpcWeb	Binary unary and server-streaming calls to an HTTP/2 origin.	gRPC-Web
gRPC and JSON transcoding	supported	plus.options: grpc.transcode.enabled	REST and JSON to gRPC through a descriptor set (Plus).	gRPC-JSON transcoding
PROXY protocol from a load balancer	supported	listeners[].acceptProxyProtocol, listeners[].trustedProxyProtocolSources	Reads the preamble only from the sources you trust.	Configuration
CONNECT-UDP relay (MASQUE)	supported	listeners[].masque	Opt-in listener type. It relays datagrams opaquely, with authentication, tunnel caps, and a private-target block.	Listeners
WebSocket over HTTP/3	supported	server.enableRfc8441	RFC 9220. HTTP/3 clients reach HTTP/1.1, HTTP/2 and HTTP/3 origins.	Protocol support
Explicit-proxy h2c Upgrade	not supported	—	Upgrade: h2c is not handled. Cleartext HTTP/2 works with prior knowledge only.	Protocol support
Decrypting QUIC inside CONNECT-UDP	not supported	—	The relay forwards each datagram as it came, so the payload stays encrypted end to end. There is no switch to decrypt it.	Listeners

L4

Capability	Status	Config key	Notes	Docs
TCP passthrough with SNI routing	supported	listeners[].passthrough, listeners[].sniRoutes, listeners[].sniDefaultClusterId	Reads the ClientHello, picks a cluster by server name, and forwards the bytes unchanged. Balancing, failover, and an idle timeout apply.	TCP passthrough
UDP relay	supported	listeners[].type, listeners[].maxSessions, listeners[].maxDatagramsPerSecondPerClient	One upstream per client endpoint, with session and rate caps.	UDP listeners
PROXY protocol v2 to TCP origins	supported	listeners[].sendProxyProtocol, clusters[].sendProxyProtocol	A cluster setting replaces the listener setting. TCP passthrough only.	PROXY protocol
TCP TLS termination and origination	supported	listeners[].terminateTls, listeners[].tlsHandshakeTimeoutSeconds, listeners[].alpn, listeners[].maxConcurrentHandshakes, clusters[].destinations[].useHttps	Terminates inbound TLS on a passthrough listener and relays plaintext, or originates TLS to upstream destinations with useHttps.	TCP TLS termination
Zone-aware load balancing	supported	clusters[].zoneAware, clusters[].destinations[].zone, server.localZone	Prefers destinations in server.localZone until too few are healthy, then spills to all zones. Off when zoneAware is unset.	Zone-aware balancing
SOCKS and transparent listeners	supported	listeners[].type	Explicit, transparent, SOCKS, QUIC, MASQUE, and UDP listener types.	Listeners

Extensibility

Capability	Status	Config key	Notes	Docs
Per-route .NET plugins	supported	plugins[].assembly, plugins[].failMode, plugins[].timeoutMs, routes[].middleware	Each plugin loads into its own collectible context, behind a timeout and an exception wall.	Plugins
Embedding the engine in .NET	supported	ProxyServer events	The same engine with event handlers, synthetic responses, and stream hooks.	Library
Programmatic route and cluster swap	supported	PUT /v1/snapshot	Plus control-plane call. File reload needs no Plus.	Graceful reload
Managed fleet control plane	supported	plus.options: manager.url, titanium-manager	titanium-manager publishes YAML revisions; Plus agents long-poll, ack or nack, and keep a last-known-good file. Not an xDS client.	Manager
xDS control plane	supported	xds.server, xds.node.id, xds.failOpen, server.reloadListeners	Requires plus.enabled and a loaded Plus module. Client only; no server. Listeners, routes, clusters, endpoints, and secrets are dynamic via ADS; see the supported-field table.	xDS
Lua scripting	supported	plugins[].kind, plugins[].file, plugins[].settings, plugins[].bodyMode, routes[].middleware	Lua 5.4 in sandboxed states, named in a route middleware list. A file runs the request-headers and buffered request-body phases; every phase runs when a .NET host sets the script pipeline. Needs the lua54 native.	Scripting
Lua sandbox, limits, and failure mode	supported	plugins[].failMode, plugins[].timeoutMs, plugins[].limits.memoryMb, plugins[].limits.maxInstructions, plugins[].limits.epochDeadlineMs, plugins[].limits.poolSize	No io, require, load, or bytecode. Memory, instruction, and CPU-time limits hold inside the engine even when the script catches errors. A failed call answers 503, or passes the request with failMode open.	Scripting
Lua libraries, shared dictionaries, and JWT verification	supported	plugins[].settings, plugins[].limits.sharedDataBytes	json, base64, hex, url, crypto, linear-time regex, cidr, uuid, timers, metrics, process-wide shared dictionaries with TTL and eviction, and JWKS-based jwt.verify.	Scripting
Lua HTTP callouts with an allow-list	supported	plugins[].calloutHosts, plugins[].limits.calloutConcurrency, plugins[].limits.bufferedBodyBytes	http.call reaches only the hosts you list. No system proxy, redirects, or cookies. Refusals and failures come back as nil and an error.	Scripting
Lua L4 stream phases	supported	listeners[].streamFilters	on_connect, on_data, and on_close see raw TCP connections. Name the plugin in listeners[].streamFilters on a passthrough listener, or set StreamFilters from a .NET host.	Scripting
Script pipeline and chained scripts	supported	scriptPipeline	Every HTTP phase, upstream choice, and several Lua or Wasm hosts in order. Set scriptPipeline in twp.yaml, or ScriptPipeline from a .NET host. Route middleware still runs the request-headers phase alone.	Scripting
WASM proxy-wasm modules	supported	plugins[].kind, plugins[].file, plugins[].vmId, plugins[].settings, plugins[].bodyMode, routes[].middleware	proxy-wasm ABI 0.1.0, 0.2.0, and 0.2.1 on Wasmtime, with the proxy-wasm ABI attribute set and a WASI subset. A module is built and started before it replaces the running one. Needs the wasmtime native.	Scripting
WASM memory, fuel, and deadline limits	supported	plugins[].failMode, plugins[].timeoutMs, plugins[].limits.memoryMb, plugins[].limits.fuel, plugins[].limits.epochDeadlineMs, plugins[].limits.poolSize	A VM that traps is discarded and rebuilt off the request path. Signal-based traps are off, so Wasmtime does not fight the .NET runtime.	Scripting
WASM HTTP and gRPC callouts with an allow-list	supported	plugins[].calloutHosts, plugins[].limits.calloutConcurrency, plugins[].limits.bufferedBodyBytes	proxy_http_call, proxy_grpc_call, and gRPC streams reach only the hosts you list. A request paused on a callout resumes when the guest continues it.	Scripting
WASM shared data, queues, ticks, and metrics	supported	plugins[].vmId, plugins[].limits.sharedDataBytes, plugins[].limits.queueBytes	Plugins with the same vmId and module share VMs, shared data with CAS, and queues. Guest metrics appear as three fixed instruments, so a guest cannot create new ones.	Scripting
Scripting natives per platform	supported	titanium scripting-deps status	Lua and Wasmtime natives are pinned per runtime identifier and checked by SHA-256. A computer without one keeps running; only a route that names that script kind fails to load. win-arm64 has none.	Scripting
OpenResty, Kong PDK, and APISIX Lua APIs	not supported	—	There is no ngx API, Kong PDK, APISIX plugin API, LuaJIT, FFI, cosocket, or require. Lua here is the 5.4 language with the libraries on the Scripting page.	Scripting
Listener changes without restart	supported	server.reloadListeners	Off by default for file reload; xDS forces it on. Reconciles listeners with drain and rollback.	xDS

This table is written from website/docs/.capabilities.yml. A unit test checks that each config key exists in twp.schema.json, that each link target exists, and that this page carries every row.

Smoke coverage: every supported product surface that ships a binary path should have an entry in tests/smoke-matrix.yml. Process CLI smokes run under TestCategory=E2E (cli-e2e). Inspector Headless/Visual, Plus dashboard Playwright, and Manager Playwright (TestCategory=E2E-UI-Manager) run in ui-portable — Manager UI must stay in that CI filter.