HTTP methods (GET, POST, PUT, DELETE) in Flask - Performance & Optimization

Performance: HTTP methods (GET, POST, PUT, DELETE)

MEDIUM IMPACT

This affects how fast the server responds and how much data is sent or received, impacting page load and interaction speed.

Sending data to update a resource on the server

Flask

from flask import Flask, request
app = Flask(__name__)

@app.route('/update', methods=['PUT'])
def update():
    data = request.get_json()
    # process update
    return 'Updated', 200

PUT sends data in the request body, allowing larger payloads and proper caching behavior, improving response speed and security.

📈 Performance GainReduces caching issues and avoids URL length limits, improving server response time

Sending data to update a resource on the server

Flask

from flask import Flask, request
app = Flask(__name__)

@app.route('/update', methods=['GET'])
def update():
    data = request.args.get('data')
    # process update
    return 'Updated', 200

Using GET to update data sends data in the URL, which is limited in size and can be cached or logged, causing security and performance issues.

📉 Performance CostCan cause unnecessary caching and slow server response due to URL length limits

Performance Comparison

Pattern	DOM Operations	Reflows	Paint Cost	Verdict
GET for fetching data	Minimal	0	Low	[OK] Good
POST for fetching data	Minimal	0	Low	[X] Bad
PUT for updating data	Minimal	0	Low	[OK] Good
GET for updating data	Minimal	0	Low	[X] Bad
DELETE for deleting data	Minimal	0	Low	[OK] Good
GET for deleting data	Minimal	0	Low	[X] Bad

Rendering Pipeline

HTTP methods affect how the browser and server communicate, influencing the time to first byte and content delivery, which impacts the rendering pipeline stages.

→Network Request

→Server Processing

→Content Download

→Render Tree Construction

⚠️ BottleneckServer Processing

Core Web Vital Affected

LCP

This affects how fast the server responds and how much data is sent or received, impacting page load and interaction speed.

Optimization Tips

1Use GET for fetching data to enable caching and faster load times.

2Use POST or PUT for sending or updating data to avoid URL length limits and caching issues.

3Use DELETE for removing resources to prevent accidental actions and improve user experience.

Performance Quiz - 3 Questions

Which HTTP method is best for retrieving data without changing server state?

A PUT

B POST

C GET

D DELETE

DevTools: Network

How to check: Open DevTools, go to Network tab, perform the action, and check the HTTP method column for the request.

What to look for: Ensure the HTTP method matches the action (GET for fetch, POST/PUT for send/update, DELETE for delete) to confirm proper usage.