## Documentation Index

Fetch the complete documentation index at: [https://docs.subtrace.dev/docs/llms.txt](https://docs.subtrace.dev/docs/llms.txt)

You can connect your Flask backend to Chrome DevTools using Subtrace with just one line of code. With Subtrace, you can inspect the status, headers, payload, and latency of all API requests so you can debug way faster. To begin with, install Subtrace:

```
pip install subtrace
```

For this guide, we’ll use the following `hello.py` Flask app as an example:

```
# Add this line to install Subtrace on your Flask server
import subtrace

from flask import Flask

app = Flask(__name__)

@app.route("/")
def hello_world():
    return "<p>Hello, World!</p>"
```

Before we move on to the next step, get a `SUBTRACE_TOKEN` from the Subtrace [dashboard](/content/dashboard/index.html) for free and set it as an environment variable.

```
# get a tracer token for free at https://subtrace.dev/dashboard
export SUBTRACE_TOKEN=
```

Now use the `flask` command to start the server on port 5000:

```
flask --app hello run
```

Send some requests to `localhost:5000` to see them in Chrome DevTools in the Subtrace dashboard!

[Gunicorn](/content/docs/python-gunicorn/index.html) [Go](/content/docs/golang/index.html)