Created
March 25, 2023 04:36
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Flask SSE demo
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| from flask import Flask, Response | |
| import time | |
| import json | |
| app = Flask(__name__) | |
| @app.route('/') | |
| def index(): | |
| return Response(''' | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Flask SSE Example</title> | |
| </head> | |
| <body> | |
| <div id="output"></div> | |
| <script> | |
| var outputEl = document.getElementById('output'); | |
| var source = new EventSource('/sse'); | |
| source.onmessage = function(event) { | |
| outputEl.innerText += JSON.parse(event.data).chunk; | |
| }; | |
| // don't auto restart connection | |
| source.onerror = function(event) { source.close(); }; | |
| </script> | |
| </body> | |
| </html> | |
| ''', mimetype='text/html') | |
| @app.route('/sse') | |
| def sse(): | |
| def _stream(): | |
| for i in range(10): | |
| data = {'chunk': f'{i}\n'} | |
| yield 'data: {}\n\n'.format(json.dumps(data)) | |
| time.sleep(1) | |
| return Response(_stream(), mimetype='text/event-stream') | |
| if __name__ == '__main__': | |
| app.run(threaded=True, debug=True) |
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