codesnips

http

typescript 
import { Injectable } from '@angular/core';
import { HttpClient, HttpParams } from '@angular/common/http';
import { Observable, of } from 'rxjs';
import { catchError } from 'rxjs/operators';

export interface SearchResult {

Debounced Typeahead Search in Angular with switchMap and Cancellation

angular rxjs typeahead
by codesnips 3 tabs
go 
package middleware

import (
  "net/http"
  "sync/atomic"
)

Track in-flight requests with atomic counters

go observability concurrency
by Leah Thompson 1 tab
typescript 
import express, { type Express, type Request, type Response } from 'express';

export function buildApp(isShuttingDown: () => boolean): Express {
  const app = express();
  app.disable('x-powered-by');

Graceful shutdown for Node HTTP servers

reliability nodejs express
by codesnips 3 tabs
go 
package feed

import (
	"encoding/base64"
	"encoding/json"
	"time"

Cursor-Based Keyset Pagination for a Postgres Feed API in Go

go postgres pagination
by codesnips 3 tabs
ruby 
class SyncContactJob < ApplicationJob
  queue_as :external

  BACKOFF = ->(executions) do
    (2**executions) + rand(0.0..1.0) # exponential + jitter, in seconds
  end

Exponential Backoff with Jitter for Flaky External API Calls in ActiveJob

rails activejob background-jobs
by codesnips 3 tabs
javascript 
function escapeCell(value) {
  if (value === null || value === undefined) return '';
  const str = String(value);
  if (/[",\n\r]/.test(str)) {
    return '"' + str.replace(/"/g, '""') + '"';
  }

Stream a Large CSV Export in Express with Backpressure and an Async Row Generator

express streaming csv
by codesnips 3 tabs
go 
package httpretry

import (
	"math/rand"
	"time"
)

Exponential Backoff With Full Jitter for Flaky HTTP Calls in Go

go http retry
by codesnips 3 tabs
go 
package observability

import (
  "context"
  "log/slog"
  "os"

Request-scoped slog logger with JSON output (Go 1.21+)

go logging observability
by Leah Thompson 1 tab
go 
package api

import (
	"encoding/json"
	"net/http"
)

Field-Level JSON Validation Errors in Go net/http Handlers

go net-http validation
by codesnips 3 tabs
typescript 
import { z } from 'zod';

export const createUserSchema = z
  .object({
    email: z.string().email(),
    name: z.string().min(1).max(120),

Runtime validation for request bodies (Zod)

typescript validation api
by codesnips 3 tabs
rust 
use std::time::Duration;
use rand::Rng;

#[derive(Clone, Debug)]
pub struct BackoffPolicy {
    pub base_delay: Duration,

Exponential Backoff With Jitter for Retrying Fallible Async Operations in Rust

rust tokio async
by codesnips 3 tabs
go 
package api

import "net/http"

func ETag(w http.ResponseWriter, r *http.Request, etag string) bool {
  w.Header().Set("ETag", etag)

ETag handling for conditional GETs (cheap caching)

go http caching
by Leah Thompson 1 tab