[Solved] Consider this middleware snippet in Flask:class ResponseModifierMiddleware: def __init__(self, app): self.app = app def __call__(self, environ, start_response):... | Flask

Flask - Middleware and Extensions

Consider this middleware snippet in Flask:

class ResponseModifierMiddleware:
    def __init__(self, app):
        self.app = app
    def __call__(self, environ, start_response):
        def custom_start(status, headers, exc_info=None):
            headers.append(('X-Processed', 'True'))
            return start_response(status, headers, exc_info)
        return self.app(environ, custom_start)

What effect does this middleware have when a request is processed?

AIt modifies the request path before Flask handles it

BIt blocks requests that do not have the 'X-Processed' header

CIt adds a custom header 'X-Processed: True' to every HTTP response

DIt logs the request body to the console

Step-by-Step Solution

Solution:

Step 1: Analyze custom_start function
The function appends a header ('X-Processed', 'True') to the response headers.
Step 2: Understand middleware call
The middleware calls the wrapped app with the modified start_response, ensuring the header is added to all responses.
Final Answer:
It adds a custom header 'X-Processed: True' to every HTTP response -> Option C
Quick Check:
Middleware modifies response headers [OK]

Quick Trick: Middleware can add headers by wrapping start_response [OK]

Common Mistakes:

MISTAKES

Confusing request modification with response modification
Assuming middleware blocks requests without that header
Thinking it logs request data

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More Flask Quizzes

Consider this middleware snippet in Flask:

Step 1: Analyze custom_start function

Step 2: Understand middleware call

Final Answer:

Quick Check:

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