FastAPI Form Data Handling: Receiving multipart/form-data
To handle `multipart/form-data` format (for mixed form and file transmission) in FastAPI, tools like `Form`, `File`, or `UploadFile` are required. Text data is received using `Form`, where `Form(...)` marks required parameters (e.g., `name: str = Form(...)`), and optional parameters can be set with default values. For file uploads, there are two methods: `File` returns binary content (suitable for simple scenarios), while `UploadFile` provides metadata such as filename and MIME type (use the `read()` method if saving the file). In mixed scenarios, both `Form` and file tools must be used simultaneously. Testing can be done by submitting requests through FastAPI's built-in Swagger UI (`http://localhost:8000/docs`). Mastering these tools enables handling requirements for form submissions with both text and files.
Read MoreFlask Request Methods: Practical Handling of GET and POST Requests
This article introduces the lightweight Python Web framework Flask and HTTP request methods GET/POST. Flask is suitable for rapid development of web applications, with the installation command being `pip install flask`. GET is used to retrieve data (data is in the URL and easily leaked), while POST is used to submit data (data is in the request body and more secure). In practice, handling a login form with Flask: define the `/login` route to support GET/POST, where GET renders the form template and POST retrieves the username and password for verification and returns the result. Key knowledge points: the `methods` parameter of the route supports multiple request methods, `request.form` extracts form data, and `render_template` renders templates. Notes: Only POST requires changing `methods=['POST']`, sensitive data should use POST and HTTPS is recommended, and CSRF protection is necessary in production environments.
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