Deploying a FastAPI App

You can find the step-by-step deployment guide here.

Application Build

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Hostman uses the following environment when building a FastAPI application:

• Python 3.10, 3.11, 3.12, 3.13, or 3.14 (you can select the version when creating an app)
• pip
• uvicorn

Hostman will execute the following commands during the build:

apt install -y p--no-install-recommends curl build-essential libpq-dev
pip install --upgrade pip
pip install fastapi uvicorn

To install dependencies, add the following line to the build command:

pip3 install --upgrade -r requirements.txt

The default start command is:

uvicorn main:app --host 0.0.0.0

If necessary, you can specify a port, for example:

uvicorn main:app --host 0.0.0.0 --port 80

Requirements

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• Make sure the application initialization file is named main.py.
• Make sure the application is listening on 0.0.0.0 rather than 127.0.0.1; otherwise, external connections will not work.