pip install flask
FLASK_DEBUG=1 FLASK_APP=app.py flask run
http://localhost:5000/static/index.html
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February 21, 2020 10:23
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Sample flask app with two-way communication
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| import json | |
| import time | |
| import random | |
| from flask import Flask, jsonify, request | |
| app = Flask(__name__) | |
| @app.route('/coordinates') | |
| def hello_world(): | |
| time.sleep(1) | |
| return jsonify({ | |
| "coordinates": [random.randint(0, 400) for _ in range(4)] | |
| }) | |
| @app.route('/post_image', methods=["POST"]) | |
| def get_image(): | |
| body = request.json | |
| print(f"received {json.dumps(body, indent=2)}") | |
| return jsonify({ | |
| "message": "ok got it", | |
| "vars": list(body.keys()) | |
| }) |
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| <!doctype html> | |
| <html lang="en"> | |
| for (let step = 0; step < 5; step++) { | |
| // Runs 5 times, with values of step 0 through 4. | |
| fetch('/coordinates') | |
| .then(res => res.json()) | |
| .then(json => console.log("received" + JSON.stringify(json))).then( | |
| e => fetch('/post_image', { | |
| method:"POST", | |
| body: JSON.stringify({ | |
| "data": "blabla", | |
| "asdfasd": "asdfasdf" | |
| }), | |
| headers: { | |
| "Content-Type<!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Uber Renderer</title> | |
| </head> | |
| <body> | |
| This is the renderer! | |
| <script src="index.js"></script> | |
| </body> | |
| </html> | |
| ": "application/json; charset=UTF-8" | |
| }}) | |
| ).then( | |
| res => console.log(res) | |
| ); | |
| } | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Uber Renderer</title> | |
| </head> | |
| <body> | |
| This is the renderer! | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| for (let step = 0; step < 5; step++) { | |
| // Runs 5 times, with values of step 0 through 4. | |
| fetch('/coordinates') | |
| .then(res => res.json()) | |
| .then(json => console.log("received" + JSON.stringify(json))).then( | |
| e => fetch('/post_image', { | |
| method:"POST", | |
| body: JSON.stringify({ | |
| "data": "blabla", | |
| "asdfasd": "asdfasdf" | |
| }), | |
| headers: { | |
| "Content-Type": "application/json; charset=UTF-8" | |
| }}) | |
| ).then( | |
| res => console.log(res) | |
| ); | |
| } |
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