How can I check if the current request is from htmx

htmx is a JavaScript library that allows you to access modern browser features such as AJAX and CSS Transitions through HTML attributes, enhancing your web pages without needing to write JavaScript.

Checking Method

When sending requests with htmx, htmx adds a specific header field HX-Request with the value true to the HTTP headers. Therefore, you can determine if the request is initiated by htmx by checking this header field.

Example Code

Assume you are using the Python Flask framework for web development; you can add the following check in the route handler:

python
from flask import request

@app.route('/some-route', methods=['GET', 'POST'])
def handle_request():
    if request.headers.get('HX-Request') == 'true':
        # This is a request initiated by htmx
        # Handle specific logic here
        return "Handled by htmx"
    else:
        # Handle regular requests
        return "Regular request handling"

Explanation

In the above code, we use request.headers.get('HX-Request') to retrieve the HX-Request field from the request headers. If this field exists and its value is true, we treat it as a request initiated by htmx and execute the corresponding handling logic.

Summary

This technique is highly applicable for scenarios where you need to differentiate and handle requests initiated by JavaScript libraries, particularly htmx, such as in single-page applications (SPAs) or situations requiring partial page refreshes. Using htmx enables you to achieve rich frontend interaction with less code, while this server-side check ensures the backend correctly responds to requests initiated by the frontend.