#request-lifecycle code explainers

typescript

import { Injectable, NestInterceptor, ExecutionContext, CallHandler } from '@nestjs/common';
import { Observable, catchError, concatMap, finalize } from 'rxjs';
import { DataSource, QueryRunner } from 'typeorm';

Wrapping requests in a transaction with NestJS

interceptors transactions rxjs

Advanced 7 steps

php

<?php
 
namespace App\Http\Middleware;

Resolving the current team in Laravel middleware

middleware multi-tenancy cookies

Intermediate 8 steps

python

import time
 
from flask import Flask, g, request

Timing requests with Flask hooks

middleware request-lifecycle instrumentation

Intermediate 5 steps

java

@Component
public class RequestTimingInterceptor implements HandlerInterceptor {
 
    private static final Logger log = LoggerFactory.getLogger(RequestTimingInterceptor.class);

How a Spring HandlerInterceptor times requests

interceptor request-lifecycle logging

Intermediate 6 steps