import logging
import platform
import ssl
import sys
import typing

import click
from asgiref.typing import ASGIApplication

import uvicorn
from uvicorn.config import (
    HTTP_PROTOCOLS,
    INTERFACES,
    LIFESPAN,
    LOG_LEVELS,
    LOGGING_CONFIG,
    LOOP_SETUPS,
    SSL_PROTOCOL_VERSION,
    WS_PROTOCOLS,
    Config,
)
from uvicorn.server import Server, ServerState  # noqa: F401  # Used to be defined here.
from uvicorn.supervisors import ChangeReload, Multiprocess

LEVEL_CHOICES = click.Choice(list(LOG_LEVELS.keys()))
HTTP_CHOICES = click.Choice(list(HTTP_PROTOCOLS.keys()))
WS_CHOICES = click.Choice(list(WS_PROTOCOLS.keys()))
LIFESPAN_CHOICES = click.Choice(list(LIFESPAN.keys()))
LOOP_CHOICES = click.Choice([key for key in LOOP_SETUPS.keys() if key != "none"])
INTERFACE_CHOICES = click.Choice(INTERFACES)

logger = logging.getLogger("uvicorn.error")


def print_version(ctx: click.Context, param: click.Parameter, value: bool) -> None:
    if not value or ctx.resilient_parsing:
        return
    click.echo(
        "Running uvicorn %s with %s %s on %s"
        % (
            uvicorn.__version__,
            platform.python_implementation(),
            platform.python_version(),
            platform.system(),
        )
    )
    ctx.exit()


@click.command()
@click.argument("app")
@click.option(
    "--host",
    type=str,
    default="127.0.0.1",
    help="Bind socket to this host.",
    show_default=True,
)
@click.option(
    "--port",
    type=int,
    default=8000,
    help="Bind socket to this port.",
    show_default=True,
)
@click.option("--uds", type=str, default=None, help="Bind to a UNIX domain socket.")
@click.option(
    "--fd", type=int, default=None, help="Bind to socket from this file descriptor."
)
@click.option(
    "--debug", is_flag=True, default=False, help="Enable debug mode.", hidden=True
)
@click.option("--reload", is_flag=True, default=False, help="Enable auto-reload.")
@click.option(
    "--reload-dir",
    "reload_dirs",
    multiple=True,
    help="Set reload directories explicitly, instead of using the current working"
    " directory.",
)
@click.option(
    "--reload-delay",
    type=float,
    default=0.25,
    show_default=True,
    help="Delay between previous and next check if application needs to be."
    " Defaults to 0.25s.",
)
@click.option(
    "--workers",
    default=None,
    type=int,
    help="Number of worker processes. Defaults to the $WEB_CONCURRENCY environment"
    " variable if available, or 1. Not valid with --reload.",
)
@click.option(
    "--loop",
    type=LOOP_CHOICES,
    default="auto",
    help="Event loop implementation.",
    show_default=True,
)
@click.option(
    "--http",
    type=HTTP_CHOICES,
    default="auto",
    help="HTTP protocol implementation.",
    show_default=True,
)
@click.option(
    "--ws",
    type=WS_CHOICES,
    default="auto",
    help="WebSocket protocol implementation.",
    show_default=True,
)
@click.option(
    "--ws-max-size",
    type=int,
    default=16777216,
    help="WebSocket max size message in bytes",
    show_default=True,
)
@click.option(
    "--ws-ping-interval",
    type=float,
    default=20,
    help="WebSocket ping interval",
    show_default=True,
)
@click.option(
    "--ws-ping-timeout",
    type=float,
    default=20,
    help="WebSocket ping timeout",
    show_default=True,
)
@click.option(
    "--lifespan",
    type=LIFESPAN_CHOICES,
    default="auto",
    help="Lifespan implementation.",
    show_default=True,
)
@click.option(
    "--interface",
    type=INTERFACE_CHOICES,
    default="auto",
    help="Select ASGI3, ASGI2, or WSGI as the application interface.",
    show_default=True,
)
@click.option(
    "--env-file",
    type=click.Path(exists=True),
    default=None,
    help="Environment configuration file.",
    show_default=True,
)
@click.option(
    "--log-config",
    type=click.Path(exists=True),
    default=None,
    help="Logging configuration file. Supported formats: .ini, .json, .yaml.",
    show_default=True,
)
@click.option(
    "--log-level",
    type=LEVEL_CHOICES,
    default=None,
    help="Log level. [default: info]",
    show_default=True,
)
@click.option(
    "--access-log/--no-access-log",
    is_flag=True,
    default=True,
    help="Enable/Disable access log.",
)
@click.option(
    "--use-colors/--no-use-colors",
    is_flag=True,
    default=None,
    help="Enable/Disable colorized logging.",
)
@click.option(
    "--proxy-headers/--no-proxy-headers",
    is_flag=True,
    default=True,
    help="Enable/Disable X-Forwarded-Proto, X-Forwarded-For, X-Forwarded-Port to "
    "populate remote address info.",
)
@click.option(
    "--server-header/--no-server-header",
    is_flag=True,
    default=True,
    help="Enable/Disable default Server header.",
)
@click.option(
    "--date-header/--no-date-header",
    is_flag=True,
    default=True,
    help="Enable/Disable default Date header.",
)
@click.option(
    "--forwarded-allow-ips",
    type=str,
    default=None,
    help="Comma seperated list of IPs to trust with proxy headers. Defaults to"
    " the $FORWARDED_ALLOW_IPS environment variable if available, or '127.0.0.1'.",
)
@click.option(
    "--root-path",
    type=str,
    default="",
    help="Set the ASGI 'root_path' for applications submounted below a given URL path.",
)
@click.option(
    "--limit-concurrency",
    type=int,
    default=None,
    help="Maximum number of concurrent connections or tasks to allow, before issuing"
    " HTTP 503 responses.",
)
@click.option(
    "--backlog",
    type=int,
    default=2048,
    help="Maximum number of connections to hold in backlog",
)
@click.option(
    "--limit-max-requests",
    type=int,
    default=None,
    help="Maximum number of requests to service before terminating the process.",
)
@click.option(
    "--timeout-keep-alive",
    type=int,
    default=5,
    help="Close Keep-Alive connections if no new data is received within this timeout.",
    show_default=True,
)
@click.option(
    "--ssl-keyfile", type=str, default=None, help="SSL key file", show_default=True
)
@click.option(
    "--ssl-certfile",
    type=str,
    default=None,
    help="SSL certificate file",
    show_default=True,
)
@click.option(
    "--ssl-keyfile-password",
    type=str,
    default=None,
    help="SSL keyfile password",
    show_default=True,
)
@click.option(
    "--ssl-version",
    type=int,
    default=SSL_PROTOCOL_VERSION,
    help="SSL version to use (see stdlib ssl module's)",
    show_default=True,
)
@click.option(
    "--ssl-cert-reqs",
    type=int,
    default=ssl.CERT_NONE,
    help="Whether client certificate is required (see stdlib ssl module's)",
    show_default=True,
)
@click.option(
    "--ssl-ca-certs",
    type=str,
    default=None,
    help="CA certificates file",
    show_default=True,
)
@click.option(
    "--ssl-ciphers",
    type=str,
    default="TLSv1",
    help="Ciphers to use (see stdlib ssl module's)",
    show_default=True,
)
@click.option(
    "--header",
    "headers",
    multiple=True,
    help="Specify custom default HTTP response headers as a Name:Value pair",
)
@click.option(
    "--version",
    is_flag=True,
    callback=print_version,
    expose_value=False,
    is_eager=True,
    help="Display the uvicorn version and exit.",
)
@click.option(
    "--app-dir",
    "app_dir",
    default=".",
    show_default=True,
    help="Look for APP in the specified directory, by adding this to the PYTHONPATH."
    " Defaults to the current working directory.",
)
@click.option(
    "--factory",
    is_flag=True,
    default=False,
    help="Treat APP as an application factory, i.e. a () -> <ASGI app> callable.",
    show_default=True,
)
def main(
    app: str,
    host: str,
    port: int,
    uds: str,
    fd: int,
    loop: str,
    http: str,
    ws: str,
    ws_max_size: int,
    ws_ping_interval: float,
    ws_ping_timeout: float,
    lifespan: str,
    interface: str,
    debug: bool,
    reload: bool,
    reload_dirs: typing.List[str],
    reload_delay: float,
    workers: int,
    env_file: str,
    log_config: str,
    log_level: str,
    access_log: bool,
    proxy_headers: bool,
    server_header: bool,
    date_header: bool,
    forwarded_allow_ips: str,
    root_path: str,
    limit_concurrency: int,
    backlog: int,
    limit_max_requests: int,
    timeout_keep_alive: int,
    ssl_keyfile: str,
    ssl_certfile: str,
    ssl_keyfile_password: str,
    ssl_version: int,
    ssl_cert_reqs: int,
    ssl_ca_certs: str,
    ssl_ciphers: str,
    headers: typing.List[str],
    use_colors: bool,
    app_dir: str,
    factory: bool,
) -> None:
    sys.path.insert(0, app_dir)

    kwargs = {
        "host": host,
        "port": port,
        "uds": uds,
        "fd": fd,
        "loop": loop,
        "http": http,
        "ws": ws,
        "ws_max_size": ws_max_size,
        "ws_ping_interval": ws_ping_interval,
        "ws_ping_timeout": ws_ping_timeout,
        "lifespan": lifespan,
        "env_file": env_file,
        "log_config": LOGGING_CONFIG if log_config is None else log_config,
        "log_level": log_level,
        "access_log": access_log,
        "interface": interface,
        "debug": debug,
        "reload": reload,
        "reload_dirs": reload_dirs if reload_dirs else None,
        "reload_delay": reload_delay,
        "workers": workers,
        "proxy_headers": proxy_headers,
        "server_header": server_header,
        "date_header": date_header,
        "forwarded_allow_ips": forwarded_allow_ips,
        "root_path": root_path,
        "limit_concurrency": limit_concurrency,
        "backlog": backlog,
        "limit_max_requests": limit_max_requests,
        "timeout_keep_alive": timeout_keep_alive,
        "ssl_keyfile": ssl_keyfile,
        "ssl_certfile": ssl_certfile,
        "ssl_keyfile_password": ssl_keyfile_password,
        "ssl_version": ssl_version,
        "ssl_cert_reqs": ssl_cert_reqs,
        "ssl_ca_certs": ssl_ca_certs,
        "ssl_ciphers": ssl_ciphers,
        "headers": [header.split(":", 1) for header in headers],
        "use_colors": use_colors,
        "factory": factory,
    }
    run(app, **kwargs)


def run(app: typing.Union[ASGIApplication, str], **kwargs: typing.Any) -> None:
    config = Config(app, **kwargs)
    server = Server(config=config)

    if (config.reload or config.workers > 1) and not isinstance(app, str):
        logger = logging.getLogger("uvicorn.error")
        logger.warning(
            "You must pass the application as an import string to enable 'reload' or "
            "'workers'."
        )
        sys.exit(1)

    if config.should_reload:
        sock = config.bind_socket()
        ChangeReload(config, target=server.run, sockets=[sock]).run()
    elif config.workers > 1:
        sock = config.bind_socket()
        Multiprocess(config, target=server.run, sockets=[sock]).run()
    else:
        server.run()


if __name__ == "__main__":
    main()

uvicorn/main.py
import logging
import platform
import ssl
import sys
import typing

import click
from asgiref.typing import ASGIApplication

import uvicorn
from uvicorn.config import (
    HTTP_PROTOCOLS,
    INTERFACES,
    LIFESPAN,
    LOG_LEVELS,
    LOGGING_CONFIG,
    LOOP_SETUPS,
    SSL_PROTOCOL_VERSION,
    WS_PROTOCOLS,
    Config,
)
from uvicorn.server import Server, ServerState  # noqa: F401  # Used to be defined here.
from uvicorn.supervisors import ChangeReload, Multiprocess

LEVEL_CHOICES = click.Choice(list(LOG_LEVELS.keys()))
HTTP_CHOICES = click.Choice(list(HTTP_PROTOCOLS.keys()))
WS_CHOICES = click.Choice(list(WS_PROTOCOLS.keys()))
LIFESPAN_CHOICES = click.Choice(list(LIFESPAN.keys()))
LOOP_CHOICES = click.Choice([key for key in LOOP_SETUPS.keys() if key != "none"])
INTERFACE_CHOICES = click.Choice(INTERFACES)

logger = logging.getLogger("uvicorn.error")


def print_version(ctx: click.Context, param: click.Parameter, value: bool) -> None:
    if not value or ctx.resilient_parsing:
        return
    click.echo(
        "Running uvicorn %s with %s %s on %s"
        % (
            uvicorn.__version__,
            platform.python_implementation(),
            platform.python_version(),
            platform.system(),
        )
    )
    ctx.exit()


@click.command()
@click.argument("app")
@click.option(
    "--host",
    type=str,
    default="127.0.0.1",
    help="Bind socket to this host.",
    show_default=True,
)
@click.option(
    "--port",
    type=int,
    default=8000,
    help="Bind socket to this port.",
    show_default=True,
)
@click.option("--uds", type=str, default=None, help="Bind to a UNIX domain socket.")
@click.option(
    "--fd", type=int, default=None, help="Bind to socket from this file descriptor."
)
@click.option(
    "--debug", is_flag=True, default=False, help="Enable debug mode.", hidden=True
)
@click.option("--reload", is_flag=True, default=False, help="Enable auto-reload.")
@click.option(
    "--reload-dir",
    "reload_dirs",
    multiple=True,
    help="Set reload directories explicitly, instead of using the current working"
    " directory.",
    type=click.Path(exists=True),
)
@click.option(
    "--reload-delay",
    type=float,
    default=0.25,
    show_default=True,
    help="Delay between previous and next check if application needs to be."
    " Defaults to 0.25s.",
)
@click.option(
    "--workers",
    default=None,
    type=int,
    help="Number of worker processes. Defaults to the $WEB_CONCURRENCY environment"
    " variable if available, or 1. Not valid with --reload.",
)
@click.option(
    "--loop",
    type=LOOP_CHOICES,
    default="auto",
    help="Event loop implementation.",
    show_default=True,
)
@click.option(
    "--http",
    type=HTTP_CHOICES,
    default="auto",
    help="HTTP protocol implementation.",
    show_default=True,
)
@click.option(
    "--ws",
    type=WS_CHOICES,
    default="auto",
    help="WebSocket protocol implementation.",
    show_default=True,
)
@click.option(
    "--ws-max-size",
    type=int,
    default=16777216,
    help="WebSocket max size message in bytes",
    show_default=True,
)
@click.option(
    "--ws-ping-interval",
    type=float,
    default=20,
    help="WebSocket ping interval",
    show_default=True,
)
@click.option(
    "--ws-ping-timeout",
    type=float,
    default=20,
    help="WebSocket ping timeout",
    show_default=True,
)
@click.option(
    "--lifespan",
    type=LIFESPAN_CHOICES,
    default="auto",
    help="Lifespan implementation.",
    show_default=True,
)
@click.option(
    "--interface",
    type=INTERFACE_CHOICES,
    default="auto",
    help="Select ASGI3, ASGI2, or WSGI as the application interface.",
    show_default=True,
)
@click.option(
    "--env-file",
    type=click.Path(exists=True),
    default=None,
    help="Environment configuration file.",
    show_default=True,
)
@click.option(
    "--log-config",
    type=click.Path(exists=True),
    default=None,
    help="Logging configuration file. Supported formats: .ini, .json, .yaml.",
    show_default=True,
)
@click.option(
    "--log-level",
    type=LEVEL_CHOICES,
    default=None,
    help="Log level. [default: info]",
    show_default=True,
)
@click.option(
    "--access-log/--no-access-log",
    is_flag=True,
    default=True,
    help="Enable/Disable access log.",
)
@click.option(
    "--use-colors/--no-use-colors",
    is_flag=True,
    default=None,
    help="Enable/Disable colorized logging.",
)
@click.option(
    "--proxy-headers/--no-proxy-headers",
    is_flag=True,
    default=True,
    help="Enable/Disable X-Forwarded-Proto, X-Forwarded-For, X-Forwarded-Port to "
    "populate remote address info.",
)
@click.option(
    "--server-header/--no-server-header",
    is_flag=True,
    default=True,
    help="Enable/Disable default Server header.",
)
@click.option(
    "--date-header/--no-date-header",
    is_flag=True,
    default=True,
    help="Enable/Disable default Date header.",
)
@click.option(
    "--forwarded-allow-ips",
    type=str,
    default=None,
    help="Comma seperated list of IPs to trust with proxy headers. Defaults to"
    " the $FORWARDED_ALLOW_IPS environment variable if available, or '127.0.0.1'.",
)
@click.option(
    "--root-path",
    type=str,
    default="",
    help="Set the ASGI 'root_path' for applications submounted below a given URL path.",
)
@click.option(
    "--limit-concurrency",
    type=int,
    default=None,
    help="Maximum number of concurrent connections or tasks to allow, before issuing"
    " HTTP 503 responses.",
)
@click.option(
    "--backlog",
    type=int,
    default=2048,
    help="Maximum number of connections to hold in backlog",
)
@click.option(
    "--limit-max-requests",
    type=int,
    default=None,
    help="Maximum number of requests to service before terminating the process.",
)
@click.option(
    "--timeout-keep-alive",
    type=int,
    default=5,
    help="Close Keep-Alive connections if no new data is received within this timeout.",
    show_default=True,
)
@click.option(
    "--ssl-keyfile", type=str, default=None, help="SSL key file", show_default=True
)
@click.option(
    "--ssl-certfile",
    type=str,
    default=None,
    help="SSL certificate file",
    show_default=True,
)
@click.option(
    "--ssl-keyfile-password",
    type=str,
    default=None,
    help="SSL keyfile password",
    show_default=True,
)
@click.option(
    "--ssl-version",
    type=int,
    default=SSL_PROTOCOL_VERSION,
    help="SSL version to use (see stdlib ssl module's)",
    show_default=True,
)
@click.option(
    "--ssl-cert-reqs",
    type=int,
    default=ssl.CERT_NONE,
    help="Whether client certificate is required (see stdlib ssl module's)",
    show_default=True,
)
@click.option(
    "--ssl-ca-certs",
    type=str,
    default=None,
    help="CA certificates file",
    show_default=True,
)
@click.option(
    "--ssl-ciphers",
    type=str,
    default="TLSv1",
    help="Ciphers to use (see stdlib ssl module's)",
    show_default=True,
)
@click.option(
    "--header",
    "headers",
    multiple=True,
    help="Specify custom default HTTP response headers as a Name:Value pair",
)
@click.option(
    "--version",
    is_flag=True,
    callback=print_version,
    expose_value=False,
    is_eager=True,
    help="Display the uvicorn version and exit.",
)
@click.option(
    "--app-dir",
    "app_dir",
    default=".",
    show_default=True,
    help="Look for APP in the specified directory, by adding this to the PYTHONPATH."
    " Defaults to the current working directory.",
)
@click.option(
    "--factory",
    is_flag=True,
    default=False,
    help="Treat APP as an application factory, i.e. a () -> <ASGI app> callable.",
    show_default=True,
)
def main(
    app: str,
    host: str,
    port: int,
    uds: str,
    fd: int,
    loop: str,
    http: str,
    ws: str,
    ws_max_size: int,
    ws_ping_interval: float,
    ws_ping_timeout: float,
    lifespan: str,
    interface: str,
    debug: bool,
    reload: bool,
    reload_dirs: typing.List[str],
    reload_delay: float,
    workers: int,
    env_file: str,
    log_config: str,
    log_level: str,
    access_log: bool,
    proxy_headers: bool,
    server_header: bool,
    date_header: bool,
    forwarded_allow_ips: str,
    root_path: str,
    limit_concurrency: int,
    backlog: int,
    limit_max_requests: int,
    timeout_keep_alive: int,
    ssl_keyfile: str,
    ssl_certfile: str,
    ssl_keyfile_password: str,
    ssl_version: int,
    ssl_cert_reqs: int,
    ssl_ca_certs: str,
    ssl_ciphers: str,
    headers: typing.List[str],
    use_colors: bool,
    app_dir: str,
    factory: bool,
) -> None:
    sys.path.insert(0, app_dir)

    kwargs = {
        "host": host,
        "port": port,
        "uds": uds,
        "fd": fd,
        "loop": loop,
        "http": http,
        "ws": ws,
        "ws_max_size": ws_max_size,
        "ws_ping_interval": ws_ping_interval,
        "ws_ping_timeout": ws_ping_timeout,
        "lifespan": lifespan,
        "env_file": env_file,
        "log_config": LOGGING_CONFIG if log_config is None else log_config,
        "log_level": log_level,
        "access_log": access_log,
        "interface": interface,
        "debug": debug,
        "reload": reload,
        "reload_dirs": reload_dirs if reload_dirs else None,
        "reload_delay": reload_delay,
        "workers": workers,
        "proxy_headers": proxy_headers,
        "server_header": server_header,
        "date_header": date_header,
        "forwarded_allow_ips": forwarded_allow_ips,
        "root_path": root_path,
        "limit_concurrency": limit_concurrency,
        "backlog": backlog,
        "limit_max_requests": limit_max_requests,
        "timeout_keep_alive": timeout_keep_alive,
        "ssl_keyfile": ssl_keyfile,
        "ssl_certfile": ssl_certfile,
        "ssl_keyfile_password": ssl_keyfile_password,
        "ssl_version": ssl_version,
        "ssl_cert_reqs": ssl_cert_reqs,
        "ssl_ca_certs": ssl_ca_certs,
        "ssl_ciphers": ssl_ciphers,
        "headers": [header.split(":", 1) for header in headers],
        "use_colors": use_colors,
        "factory": factory,
    }
    run(app, **kwargs)


def run(app: typing.Union[ASGIApplication, str], **kwargs: typing.Any) -> None:
    config = Config(app, **kwargs)
    server = Server(config=config)

    if (config.reload or config.workers > 1) and not isinstance(app, str):
        logger = logging.getLogger("uvicorn.error")
        logger.warning(
            "You must pass the application as an import string to enable 'reload' or "
            "'workers'."
        )
        sys.exit(1)

    if config.should_reload:
        sock = config.bind_socket()
        ChangeReload(config, target=server.run, sockets=[sock]).run()
    elif config.workers > 1:
        sock = config.bind_socket()
        Multiprocess(config, target=server.run, sockets=[sock]).run()
    else:
        server.run()


if __name__ == "__main__":
    main()

uvicorn/main.py
diff --git a/docs/deployment.md b/docs/deployment.md
index 86c6d9027..a251f4a1c 100644
--- a/docs/deployment.md
+++ b/docs/deployment.md
@@ -35,7 +35,7 @@ Options:
   --uds TEXT                      Bind to a UNIX domain socket.
   --fd INTEGER                    Bind to socket from this file descriptor.
   --reload                        Enable auto-reload.
-  --reload-dir TEXT               Set reload directories explicitly, instead
+  --reload-dir PATH               Set reload directories explicitly, instead
                                   of using the current working directory.
   --reload-delay FLOAT            Delay between previous and next check if
                                   application needs to be. Defaults to 0.25s.
diff --git a/docs/index.md b/docs/index.md
index a18f32cc3..957882c72 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -108,7 +108,7 @@ Options:
   --uds TEXT                      Bind to a UNIX domain socket.
   --fd INTEGER                    Bind to socket from this file descriptor.
   --reload                        Enable auto-reload.
-  --reload-dir TEXT               Set reload directories explicitly, instead
+  --reload-dir PATH               Set reload directories explicitly, instead
                                   of using the current working directory.
   --reload-delay FLOAT            Delay between previous and next check if
                                   application needs to be. Defaults to 0.25s.
diff --git a/uvicorn/main.py b/uvicorn/main.py
index 29db197f2..1d3260ade 100644
--- a/uvicorn/main.py
+++ b/uvicorn/main.py
@@ -77,6 +77,7 @@ def print_version(ctx: click.Context, param: click.Parameter, value: bool) -> No
     multiple=True,
     help="Set reload directories explicitly, instead of using the current working"
     " directory.",
+    type=click.Path(exists=True),
 )
 @click.option(
     "--reload-delay",

typo in `--reload-dir` is passed silently (watchgod)
### Checklist

### Describe the bug
if I supply a directory to `--reload-dir` which does not exist, the server starts.

```
./bin/uvicorn --host localhost --port 8000 --reload  --reload-dir asdfasfsrc foo.asgi:application
INFO:     Uvicorn running on http://localhost:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [123571] using watchgod
INFO:     Started server process [123573]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
```
```
./bin/uvicorn  --version
Running uvicorn 0.13.4 with CPython 3.8.5 on Linux
```

### Expected behavior

I want the server to not start, if the reload-dir does not exist.

### Actual behavior

The server starts.


