> I don't want to learn any more html, the webserver is more or less a debugging tool
Well. AI to the rescue!
Me: Dear Copilot, show me example html code for a button that starts upload of a file from web browser on a PC to the http server. How the upload of file works form the point of view of the server?
Copilot (5 seconds later): - Let’s start by creating a simple HTML button that allows users to upload files from their web browser to an HTTP server. Then I’ll explain how the file upload process works from the server’s perspective.
HTML Code for File Upload Button
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>File Upload Example</title>
</head>
<body>
<form action="/upload" method="POST" enctype="multipart/form-data">
<label for="fileInput">Choose a file:</label>
<input type="file" id="fileInput" name="file">
<input type="submit" value="Upload">
</form>
</body>
</html>
AI-generated code. Review and use carefully.
In this example:
- We create a form with an action attribute set to /upload. When the user submits the form, the browser sends a POST request to the specified server endpoint (/upload in this case).
- The enctype="multipart/form-data" attribute ensures that the form data includes binary files (like uploaded files).
- The <input type="file"> element allows users to select a file from their local system.
- The name="file" attribute specifies the name of the input field that will hold the uploaded file data.
- The <input type="submit"> button triggers the form submission.
How File Upload Works from the Server’s Perspective
Client Request:
- The user selects a file and clicks the “Upload” button.
- The browser sends a POST request to the server with the file data attached.
Server Handling:
- The server receives the request at the specified endpoint (/upload).
- It processes the request and extracts the uploaded file data.
- The server may perform additional validation (e.g., file type, size) and security checks.
File Storage:
- The server saves the uploaded file to a designated location (e.g., a specific folder on the server).
- The file can be stored on the local file system or in a cloud storage service.
Response to Client:
- The server responds to the client (browser) with a success or error message.
- If successful, the server may provide a link to access the uploaded file.
Handling on the Server:
- The server can process the uploaded file further (e.g., resize images, extract data, save to a database).
- It can trigger additional actions (e.g., send notifications, update records).
(end session)
That's it for the embedded server. Example html for simple page can be found in the original LwIP examples:
https://github.com/lwip-tcpip/lwip/tree/master/src/apps/http/fs
You can instead want to be a web client and pull the update file from a simple tcp or http server or a cloud service.
