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37 lines
1.2 KiB
Markdown
37 lines
1.2 KiB
Markdown
# `@now/static-build` Failed to detect a server running
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#### Why This Warning Occurred
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When running `now dev`, the `@now/static-build` builder proxies relevant HTTP
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requests to the server that is created by the `now-dev` script in the
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`package.json` file.
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In order for `now dev` to know which port the server is running on, the builder
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is provided a `$PORT` environment variable that the server _must_ bind to. The
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error "Failed to detect a server running on port" is printed if the builder fails
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to detect a server listening on that specific port within five minutes.
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#### Possible Ways to Fix It
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Please ensure that your `now-dev` script binds the spawned development server on
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the provided `$PORT` that the builder expects the server to bind to.
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For example, if you are using Gatsby, your `now-dev` script must use the `-p`
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(port) option to bind to the `$PORT` specified from the builder:
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> _In Windows environments, reference the `PORT` environment variable with `%PORT%`_
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```
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{
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...
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"scripts": {
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...
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"now-dev": "gatsby develop -p $PORT"
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}
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}
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```
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Consult your static builder program's `--help` or documentation to figure out what
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the command line flag to bind to a specific port is (in many cases, it is one of:
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`-p` / `-P` / `--port`).
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