Suppose a Flask app has the following routes. What will print when a user visits home.html? @app.route(“/img.svg”) def svg(): print(“A”) return “” @app.route(“/img.png”) def png(): print(“B”) return “” @app.route(“/home.html”) def home(): print(“C”) return “
img.png
”

Question

Suppose a Flask app has the following routes. What will print when a user visits home.html? @app.route(“/img.svg”) def svg(): print(“A”) return “” @app.route(“/img.png”) def png(): print(“B”) return “” @app.route(“/home.html”) def home(): print(“C”) return “

img.png

”

BlackTom AI · Accepted Answer

Requesting /home.html triggers the home() route, so "C" is printed immediately; the returned HTML includes an

tag, so the browser then requests /img.svg and that route prints "A". No request is made to /img.png because "img.png" appears only as plain text inside a

, not as an image source. 1) Relevant knowledge points and concepts - Flask routes are executed on each matching HTTP request; any print() in the route handler appears in the server console when that route is called. - When a browser loads an HTML page it first requests the page (home.html), then parses the HTML and issues additional HTTP requests for resources referenced by tags like . - Plain text inside HTML (e.g., inside

) does not cause additional HTTP requests. 2) Step-by-step reasoning - User visits /home.html in the browser. - Flask matches @app.route("/home.html") and calls home(). home() executes print("C") and returns the HTML string. - The server console now shows "C". - The browser receives and parses the HTML. It sees a paragraph containing the literal text "img.png" (no resource fetch) and an image tag . - The browser issues a separate GET request to /img.svg. - Flask matches @app.route("/img.svg") and calls svg(), which executes print("A") and returns an empty body. - The server console now shows "A" after the earlier "C". - No request is made to /img.png because there is no tag or other reference that would trigger a GET for that path. 3) Intermediate steps shown - Request 1: GET /home.html -> executes home() -> prints: C - Request 2 (from browser parsing): GET /img.svg -> executes svg() -> prints: A - No GET /img.png occurs. 4) Why the correct answer is correct Because home() runs first (printing C) and the HTML it returns causes the browser to request img.svg (triggering A). img.png is only text and never requested, so B is not printed. 5) Why other options are incorrect - Any option claiming B prints is wrong because /img.png is never requested. - Any option that omits C is wrong because visiting /home.html directly calls home() and prints C. 6) Conclusion The prints occur in the order C then A, so the correct answer is AC, which matches the provided answer.

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