[Solved] What is the issue with this Flask polling endpoint code?@app.route('/poll') def poll(): data = {'count': 10} return json.dumps(data) | Flask

Flask - WebSocket and Real-Time

What is the issue with this Flask polling endpoint code?

@app.route('/poll')
def poll():
    data = {'count': 10}
    return json.dumps(data)

Ajson.dumps is not imported, causing a NameError

Bjson.dumps returns a string, but Flask expects a Response object or tuple

CThe route decorator is missing the methods argument

DReturning a dictionary directly is preferred over json.dumps

Step-by-Step Solution

Solution:

Step 1: Understand return types in Flask
Flask expects a Response, string, or tuple; json.dumps returns a JSON string but without proper content-type.
Step 2: Identify missing content-type
Returning json.dumps(data) returns a string but Flask won't set 'application/json' automatically.
Final Answer:
json.dumps returns a string, but Flask expects a Response object or tuple -> Option B
Quick Check:
Use jsonify to set content-type automatically [OK]

Quick Trick: jsonify sets content-type; json.dumps does not [OK]

Common Mistakes:

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What is the issue with this Flask polling endpoint code?