DominScript — http

37 functionsnamespace http_serversource plugins/http_server/HttpServerPlugin.c

Introduction

The http_server plugin provides a simple, callback-based HTTP server: Open binds a TCP port and forwards every incoming HTTP request to a script-level callback. The callback receives the RAW HTTP request bytes (the request line, headers, and body) and returns a raw HTTP response blob — the plugin sends it straight back to the client. Request parsing and response building are the script's job (or a helper plugin's), so the solution is minimal but fully flexible.

Relationship to async_meta

The plugin is fully built on the async_meta constants. Capabilities() returns exactly the async_meta.ProfileRouteControl() bitmask (=2442): WaitDrained | RouteMeta | RouteInfo | RouteClose | Known. RouteState returns async_meta.RouteStateOpen (=1) / RouteStateClosed (=0), and RouteMeta(listenerId, key) knows the async_meta.RouteMeta* keys (State, Timeout, Pending, Queued, Running, Drained, Known, CloseAccepted, ClosedQueued).

One listener = one route

It is important to understand the plugin's design choice: http_server is NOT a URL router. Every Open call creates a single listener with a single route (= a single callback). Incoming HTTP request URLs are NOT resolved by the plugin — the entire raw request reaches the callback, and the callback decides what to do (path-based routing, static file, REST handler, etc.). For multiple route handlers, open several listeners on different ports, or branch in a single callback on the request line.

Two bind modes

The fourth (optional) argument of Open is the bind mode. BindLocalOnly (=0): listens only on the loopback (127.0.0.1) interface, safe for sandbox development and testing. BindAny (=1): listens on every interface (0.0.0.0), reachable from other hosts on the network — use it only when you intentionally publish a service. The default is BindLocalOnly if the argument is not provided.

Peer metadata: the extended callback forms

The handler may declare extra parameters, and the host fills them in with the client's identity — useful for access logs, IP-based filtering, or mTLS-based authorization:

callback i32 NAME(ref blob $Request) — payload only.
callback i32 NAME(ref blob $Request, string $PeerHost, i32 $PeerPort) — plus the client's address and port.
callback i32 NAME(ref blob $Request, string $PeerHost, i32 $PeerPort, string $PeerCertSubject) — plus the client certificate's subject when the connection is mTLS-verified (empty when there is no TLS, or when an optional-mode client presented no certificate).

The same forms work on the TCP and UDP callback families, so a handler moves between transports unchanged.

Loading the plugin

plugin "builtin:print";
plugin "../plugins/async_meta/AsyncMetaPlugin";
plugin
"../plugins/http_server/HttpServerPlugin";

A typical flow — minimal HTTP server

callback i32 OnRequest(ref blob $Request)
{
    // The callback receives the RAW HTTP request as a blob.
    // Modify the blob with the response, or return a new blob.
    return(1);
}
i32 main()
{
    i64 $lid;
    $lid = http_server.Open("OnRequest", -1, 8080,
    http_server.BindLocalOnly());
    // ... the server runs on the accept thread ...
    http_server.Close($lid);
    return(0);
}

Two-step shutdown: RouteClose, then Close

The plugin offers two shutdown phases. (1) RouteClose(listenerId) signals the route is to be closed: no new requests, but already running callbacks finish. WaitRouteDrained(listenerId, timeoutMs) can then be awaited. (2) Close(listenerId) is the full listener (TCP socket + accept thread) shutdown. In simpler cases just Close is enough — it implicitly performs the former too.

Listener- and route-level queries

Many query functions in the plugin distinguish two levels. The LISTENER level (Port, BindMode/Text, State/Text, Active, Pending, Queued, Running, Drained, WaitDrained, Info, OpenCount) describes the TCP socket and active/queued requests. The ROUTE level (RouteState/Text, RouteCallback, RouteTimeout, RouteKnown, RouteMeta, RouteInfo, RoutePending, RouteQueued, RouteRunning, RouteDrained, WaitRouteDrained, RouteCloseAccepted, RouteClosedQueued, RouteCloseInfo, RouteClose) works in the async meta model and uses async_meta constants for its key codes. With one listener, both levels show identical states; the distinction matters for the shared vocabulary with multi-route listeners (TCP/general).

What to know about every function (the basics)

The callback receives RAW HTTP request bytes as a blob; the response is a RAW HTTP response blob the plugin writes back to the socket directly.
BindMode codes: 0 = BindLocalOnly (default), 1 = BindAny. BindModeText in text: “local” or “any”.
State / RouteState return async_meta.RouteStateOpen (=1) / RouteStateClosed (=0); the *Text counterparts in text.
WaitDrained and WaitRouteDrained return 1 if drained occurs before the timeoutMs expires; 0 if it expired.
RouteClose closes the route layer; RouteCloseAccepted becomes 1 afterward. Close shuts down the whole listener (TCP socket + thread).
Two-step shutdown rule: if you first call RouteClose successfully (1), then Close, Close returns 0 (because the listener is no longer in active state when Close is called — the route layer was already closed).
port = 0 makes the OS pick the port; the actual port is queried with Port($lid).
An error (stopping the script) is caused by a wrong argument count or type, an out-of-range port (0..65535) or timeoutMs, an invalid bind mode, an already-closed listener, a bind/listen failure, and a thread startup failure.

How to read the signatures

callbackName is the script-level request callback name (callback i32 NAME(ref blob $X)). timeoutMs is the callback's run-time limit in ms; -1 = infinite. port is the TCP port (0..65535; 0 = OS picks). bindMode is the integer returned by http_server.BindLocalOnly() or http_server.BindAny(). listenerId is the positive id given by Open. metaKey is one of the async_meta.RouteMeta* values. The type after the -> arrow is the return type.

Lifecycle and bind configuration

Plugin capability query, bind-mode constants, and listener open/close.

http_server.Capabilities

http_server.Capabilities() -> int

Returns the listener's capability bitmask matching the async_meta constants.

Parameters

This function takes no arguments.

Return value

async_meta.ProfileRouteControl (=2442): WaitDrained | RouteMeta | RouteInfo | RouteClose | Known.

Example

printf("%d\n", http_server.Capabilities());
printf("%d\n", (http_server.Capabilities() ==
async_meta.ProfileRouteControl()));

Output after running

2442
1

When to use

For backend capability checking with the Supports* helpers. Worker plugins (e.g. worker = 3701) and listener plugins (http_server = 2442) return different bitmasks — so code can adapt automatically.

http_server.BindLocalOnly

http_server.BindLocalOnly() -> int

Returns the constant value of the “loopback only” bind mode.

Parameters

This function takes no arguments.

Return value

Example

printf("%d\n", http_server.BindLocalOnly());

Output after running

When to use

For the fourth argument of Open, when you want a safe local server (sandbox development, test environment). This is the default mode if the bindMode argument is not given.

http_server.BindAny

http_server.BindAny() -> int

Returns the constant value of the “any interface” bind mode.

Parameters

This function takes no arguments.

Return value

Example

printf("%d\n", http_server.BindAny());

Output after running

When to use

When the HTTP server should be reachable from other hosts (public service). Use it only as a conscious choice for security reasons — the loopback-only mode is safer by default.

http_server.OpenTls

http_server.OpenTls(certFile, keyFile, callbackName, timeoutMs, port?, bindMode?) -> listener id

Opens an HTTPS listener in a SINGLE call. The listener is TLS from birth — unlike an Open + EnableTls pair, no plaintext window ever exists. The certificate, the key and the TLS provider are pre-flight-checked at open time, so a bad path fails here with a clean, script-visible error instead of silently dropping connections later.

Parameters

Parameter	Type	Description
certFile	string	Path to the server certificate chain (PEM).
keyFile	string	Path to the matching private key (PEM).
callbackName	string	The script-level callback to dispatch requests to.
timeoutMs	int	The callback's run-time limit in milliseconds.
port	int	Optional. 0 (or omitted) lets the OS pick; read it back with Port.
bindMode	int	Optional. BindLocalOnly (0, default) or BindAny (1).

Return value

Returns a positive listener id, or a negative value on failure.

Note

The TLS layer lives in the tls plugin, which this plugin loads on demand — the script needs no tls import of its own.

http_server.EnableTls

http_server.EnableTls(listenerId, certFile, keyFile) -> 0

Upgrades an already-open listener: connections accepted from then on are TLS-wrapped. The exact counterpart of tcp_server.EnableTls. Prefer OpenTls when you can — it leaves no plaintext window between Open and the upgrade.

Parameters

Parameter	Type	Description
listenerId	int	The listener id returned by Open.
certFile	string	Path to the server certificate chain (PEM).
keyFile	string	Path to the matching private key (PEM).

Return value

Returns 0 on success.

http_server.SetClientCa

http_server.SetClientCa(listenerId, caFile, mode) -> 0

Turns on mTLS: requires (mode 2) or accepts (mode 1) a client certificate signed by the given CA. Call it BEFORE EnableTls / OpenTls-accepted connections — the TLS objects inherit the mode. With mTLS on, the 4-parameter callback form receives the verified client's certificate subject.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.
caFile	string	Path to the CA bundle (PEM) that client certificates are verified against.
mode	int	1 = optional (accept a certificate if offered), 2 = required (reject clients without a valid one).

Return value

Returns 0 on success.

http_server.Open

http_server.Open(callbackName, timeoutMs, port?, bindMode?) ->
int

Opens an HTTP listener on a TCP port and forwards incoming requests to the callback via an accept thread.

Parameters

Parameter	Type	Description
callbackName	string	The script-level callback name to call. Signature: `callback i32 NAME(ref blob $X)`.
timeoutMs	int	The callback's run-time limit in ms. -1 = infinite; otherwise 0..2147483647.
port	int	Optional TCP port (0..65535). 0 lets the OS pick. Default: 0.
bindMode	int	Optional bind mode: http_server.BindLocalOnly() (0, default) or http_server.BindAny() (1).

Return value

The listenerId (positive i64). A bad argument, a bind failure, or a thread startup failure raises a runtime error.

Example

callback i32 OnRequest(ref blob $X) { return(1); }
i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0,
http_server.BindLocalOnly());
printf("%d\n", ($lid > 0));

Output after running

When to use

For starting a local HTTP service (debug server, local REST API, static file server). The 0-port is handy in CI/test environments. The returned listenerId is the input of every further operation.

http_server.Close

http_server.Close(listenerId) -> int

Closes the listener: stops the accept thread, shuts down the socket, and releases resources.

Parameters

Parameter	Type	Description
listenerId	int	The positive listenerId from Open.

Return value

1 if the listener was open and closed successfully; 0 if it was already closed (e.g. after a prior RouteClose). An unknown or non-positive listenerId raises a runtime error.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.Close($lid));

Output after running

When to use

For clean listener shutdown at the script's end. Close waits for in-progress callbacks to finish, so it gives a clean-state shutdown. If you called RouteClose first, Close returns 0 (the listener was no longer active).

Listener-level state

Current state of the active listener: bound port and mode, “open/closed” state, and a plugin-level OpenCount.

http_server.Port

http_server.Port(listenerId) -> int

Returns the listener's actual, bound TCP port.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The port (1..65535).

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", (http_server.Port($lid) > 0));

Output after running

When to use

Particularly useful when you passed port=0 to Open (asking for an OS-picked port). You query the returned port number with this to advertise to clients.

http_server.BindMode

http_server.BindMode(listenerId) -> int

Returns the listener's bind-mode constant.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

http_server.BindLocalOnly() (=0) or http_server.BindAny() (=1).

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0,
http_server.BindLocalOnly());
printf("%d\n", http_server.BindMode($lid));

Output after running

When to use

For programmatic bind-mode checking: compare against BindLocalOnly() / BindAny(). Useful for logging or security audits.

http_server.BindModeText

http_server.BindModeText(listenerId) -> string

Returns the bind mode in human-readable text.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

“local” for BindLocalOnly; “any” for BindAny.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0,
http_server.BindLocalOnly());
print.Line(http_server.BindModeText($lid));

Output after running

local

When to use

For logging, developer UI. Textual counterpart of BindMode.

http_server.State

http_server.State(listenerId) -> int

Returns the listener's state using the async_meta route-state constants.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

async_meta.RouteStateOpen (=1) if open; async_meta.RouteStateClosed (=0) if closed.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.State($lid));

Output after running

When to use

For programmatic state checking. Shared vocabulary with the callback_* family: comparing with async_meta.RouteStateOpen makes the code uniform and portable.

http_server.StateText

http_server.StateText(listenerId) -> string

Returns the listener's state as text.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

“open” if open; “closed” if closed.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
print.Line(http_server.StateText($lid));

Output after running

open

When to use

For logging or UI display. Textual counterpart of State's numeric value.

http_server.OpenCount

http_server.OpenCount() -> int

Returns the number of currently open HTTP listeners (plugin-level, global view).

Parameters

This function takes no arguments.

Return value

The number of open listeners (0 if none).

Example

printf("%d\n", http_server.OpenCount());
i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.OpenCount());
http_server.Close($lid);
printf("%d\n", http_server.OpenCount());

Output after running

0
1
0

When to use

For resource control and diagnostics: if it does not return to 0 after Close, it signals a resource leak.

Listener-level traffic

Current traffic metrics of the listener: active, pending, queued, running requests; drain state and blocking wait.

http_server.Active

http_server.Active(listenerId) -> int

Returns the number of requests currently being processed.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The number of active requests (>= 0).

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.Active($lid));

Output after running

When to use

For monitoring the server's current load. 0 with no traffic; a high value may signal congestion.

http_server.Pending

http_server.Pending(listenerId) -> int

Returns the number of pending (not yet started) requests.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The number of pending requests.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.Pending($lid));

Output after running

When to use

An early signal of input congestion. A high Pending shows that callbacks are slow and requests pile up.

http_server.Queued

http_server.Queued(listenerId) -> int

Returns the number of queued requests.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The number of queued requests.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.Queued($lid));

Output after running

When to use

For monitoring the internal queue length. Pending + Queued together give the full waiting picture.

http_server.Running

http_server.Running(listenerId) -> int

Returns the number of currently running requests (in-callback).

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The number of running requests.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.Running($lid));

Output after running

When to use

For monitoring parallelism: if too high, look at callback performance or lower timeoutMs.

http_server.Drained

http_server.Drained(listenerId) -> int

Tells whether the listener is “drained” (no active, pending, queued, or running request).

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

1 if drained; 0 if something is in progress.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.Drained($lid));

Output after running

When to use

Before clean shutdown: ensure Drained is 1 before calling Close. With traffic, WaitDrained blocks for this.

http_server.WaitDrained

http_server.WaitDrained(listenerId, timeoutMs) -> int

Blocks until the listener is fully drained, or the timeoutMs expires.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.
timeoutMs	int	Maximum wait in ms; -1 = infinite.

Return value

1 if drain occurred before timeoutMs expired; 0 if it expired.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.WaitDrained($lid, 50));

Output after running

When to use

For a simple, correct shutdown pattern: call this after RouteClose so every in-progress callback can finish. On expired timeout, you can decide on a forced shutdown via Close.

http_server.Info

http_server.Info(listenerId) -> string

Returns the listener's aggregated key=value diagnostic state as a string.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

A space-separated key=value list (id, state, callback, timeout, port, bind, bindCode, active).

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
print.Line(http_server.Info($lid));

Output after running

id=1 state=open callback=OnRequest timeout=-1 port=<auto>
bind=local bindCode=0 active=0

When to use

For detailed diagnostics in a single call. The keys are stable; easy to parse with str.* operations.

Route-level state

The state of the listener's route layer, in the async_meta vocabulary. One listener has one route; the Route* verbs use the async meta model's terminology.

http_server.RouteState

http_server.RouteState(listenerId) -> int

Returns the route's state using the async_meta route-state constants.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

async_meta.RouteStateOpen (=1) or RouteStateClosed (=0).

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RouteState($lid));

Output after running

When to use

Value equivalent to State (one listener, one route), but using the async_meta terminology in the Route* family. Use it when you want code uniform with other route-controlled backends.

http_server.RouteStateText

http_server.RouteStateText(listenerId) -> string

Returns the route's state in text.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

“open” or “closed”.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
print.Line(http_server.RouteStateText($lid));

Output after running

open

When to use

For logging or UI display in the Route* family.

http_server.RouteCallback

http_server.RouteCallback(listenerId) -> string

Returns the callback name passed at Open.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The callback name as text.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
print.Line(http_server.RouteCallback($lid));

Output after running

OnRequest

When to use

For diagnostics or reflectivity: confirming the callback name bound to the listener, e.g. in log messages.

http_server.RouteTimeout

http_server.RouteTimeout(listenerId) -> int

Returns the callback's run-time max value in milliseconds.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The timeoutMs (the value passed at Open); -1 for infinite wait.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RouteTimeout($lid));

Output after running

-1

When to use

Reflective query of configuration. -1 means infinite wait — no forced shutdown time limit for the callback.

http_server.RouteKnown

http_server.RouteKnown(listenerId) -> int

Tells whether the route bound to the listener is known (= the listener is open).

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

1 if known; 0 if the listener is already closed or unknown.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RouteKnown($lid));

Output after running

When to use

Defensive check before a Route* query. A 0 signals the listener is no longer active.

http_server.RouteMeta

http_server.RouteMeta(listenerId, metaKey) -> int

Returns a specific meta field of the route by async_meta.RouteMeta* keys.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.
metaKey	int	An async_meta.RouteMeta* value (State=1, Timeout=2, Pending=3, Queued=4, Running=5, Drained=6, Known=7, CloseAccepted=8, ClosedQueued=9).

Return value

The value matching the field (see the async_meta documentation).

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RouteMeta($lid,
async_meta.RouteMetaState()));
printf("%d\n", http_server.RouteMeta($lid,
async_meta.RouteMetaDrained()));

Output after running

1
1

When to use

One uniform query on the route's state — with the exact keys from the async_meta vocabulary. If your code is portable across several backends, this form is the portable query.

http_server.RouteInfo

http_server.RouteInfo(listenerId) -> string

Returns the route's aggregated key=value diagnostic state as a string.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

A space-separated key=value list (id, state, stateCode, callback, timeout, port, bind, bindCode, drained, pending, queued, running, active).

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", (str.Len(http_server.RouteInfo($lid)) > 0));

Output after running

When to use

For a complete route state snapshot in one call. Broader than Info — also includes the traffic metrics.

Route-level traffic and shutdown

Traffic measured at the route layer (equivalent to the listener level, only with the async_meta terminology), and the route shutdown process.

http_server.RoutePending

http_server.RoutePending(listenerId) -> int

Returns the number of route-level pending requests.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The number of pending requests.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RoutePending($lid));

Output after running

When to use

Equivalent to listener-level Pending (with one route). The Route* family follows the async_meta terminology.

http_server.RouteQueued

http_server.RouteQueued(listenerId) -> int

Returns the number of route-level queued requests.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The number of queued requests.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RouteQueued($lid));

Output after running

When to use

Equivalent to listener-level Queued. For monitoring congestion.

http_server.RouteRunning

http_server.RouteRunning(listenerId) -> int

Returns the number of route-level currently running requests.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

The number of running requests.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RouteRunning($lid));

Output after running

When to use

Equivalent to listener-level Running. For monitoring parallelism.

http_server.RouteDrained

http_server.RouteDrained(listenerId) -> int

Tells whether the route is “drained” (pending = queued = running = 0).

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

1 if drained; 0 if something is in progress.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RouteDrained($lid));

Output after running

When to use

Equivalent to listener-level Drained. For pre-shutdown clean-state verification.

http_server.WaitRouteDrained

http_server.WaitRouteDrained(listenerId, timeoutMs) -> int

Blocks until the route is fully drained, or the timeoutMs expires.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.
timeoutMs	int	Maximum wait in ms; -1 = infinite.

Return value

1 if drain occurred before timeoutMs expired; 0 if it expired.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.WaitRouteDrained($lid, 50));

Output after running

When to use

Route-level counterpart of WaitDrained. In the two-phase shutdown pattern, call AFTER RouteClose, before fully stopping with Close.

http_server.RouteCloseAccepted

http_server.RouteCloseAccepted(listenerId) -> int

Tells whether the RouteClose request has been accepted.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

1 if yes; 0 if no (no RouteClose yet, or rejected).

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
http_server.RouteClose($lid);
printf("%d\n", http_server.RouteCloseAccepted($lid));

Output after running

When to use

For confirming the two-phase shutdown: RouteClose returned 1, and this also returns 1 — shutdown is in progress.

http_server.RouteClosedQueued

http_server.RouteClosedQueued(listenerId) -> int

Tells whether the route shutdown has been queued (the background thread is processing it).

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

1 if yes; 0 if not yet.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RouteClosedQueued($lid));

Output after running

When to use

For finer-grained shutdown phase tracking: after RouteClose acceptance, this becomes 1 when the background thread actually starts the shutdown.

http_server.RouteCloseInfo

http_server.RouteCloseInfo(listenerId) -> string

Returns the detailed key=value diagnostic state of the route shutdown process.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

A space-separated key=value list (id, state, callback, timeout, port, bind, drained, pending, queued, running, active, closeAccepted, closedQueued).

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", (str.Len(http_server.RouteCloseInfo($lid)) >
0));

Output after running

When to use

Extended version of RouteInfo: also contains shutdown process fields (closeAccepted, closedQueued). For detailed shutdown logging.

http_server.RouteClose

http_server.RouteClose(listenerId) -> int

Requests the route shutdown: no new requests, in-progress ones finish.

Parameters

Parameter	Type	Description
listenerId	int	The listener id.

Return value

1 if the plugin accepted the request; 0 if the route is already closed.

Example

i64 $lid;
$lid = http_server.Open("OnRequest", -1, 0);
printf("%d\n", http_server.RouteClose($lid));

Output after running

When to use

First step of the two-phase shutdown. Call this first, then WaitRouteDrained for in-progress requests to finish, finally Close for the full listener shutdown.

Practical notes

What the http_server plugin is good for

Starting a local HTTP service for sandbox development, test environment, REST API mock.
Static file server: the callback returns file contents in an HTTP response blob based on the request URL.
Event-driven processing: every HTTP request is a callback invocation; the script can focus on the content.
Full control at the HTTP protocol level: the plugin does not interpret or restrict — the callback decides whether to parse or delegate.

Processing the callback blob

The callback receives the RAW HTTP request bytes — across the request line, headers, and (any) body. The callback's job is parsing the request (at least extracting the method, URL, and headers) and producing a RAW HTTP response blob. The response blob must be in proper HTTP format: HTTP/1.1 200 OK\r\nContent-Type: ...\r\nContent-Length: N\r\n\r\n<body>. The plugin sends the blob unchanged — there is no automatic header or status-code injection.

One listener with one route: the design choice

The plugin offers a single route layer per listener — it is not a URL router. This design choice follows the single-responsibility principle: the plugin only does TCP-level accept and callback forwarding; content-based routing is the callback's or a helper-router's job. For multiple route handlers, either open several listeners on different ports, or branch in a single callback based on the request line (method + URL).

Two-step shutdown pattern

(1) RouteClose: signals new requests are not accepted; in-progress ones may finish. (2) WaitRouteDrained(timeoutMs): blocks until every in-flight callback finishes, or the timeout expires. (3) Close: the full listener (TCP socket + accept thread) shutdown. In simpler cases, Close alone is enough — it implicitly performs the above, but doesn't give fine timing. For high-throughput servers, the two-step method is more flexible.

Listener- and route-level equivalence

A listener has a single route, so Pending == RoutePending, Queued == RouteQueued, etc. The two levels still exist for the shared vocabulary with bus / tcp_server: those plugins may have MULTIPLE routes (one listener with several path handlers), and there the two levels give different values. In http_server, both show the same — pick the one that fits your code style.

Error handling

A wrong argument count or type, an out-of-range port (0..65535) or timeoutMs, an invalid bind mode, a failed bind/listen, a thread startup failure, and touching an already-closed listener are reported by the runtime as a runtime error, and the script stops. Close signals an open listener with 1 and an already-closed (or RouteClose-handled) one with 0 — but both are successful call results.