Blog
HTTP header tips, Chrome extension security, and developer workflow guides.
ModHeader Removed From Chrome and Edge: What Happened and What to Do
Google and Microsoft pulled ModHeader after researchers found a hidden browsing-history collector in the official extension. Here's exactly what was found, whether your data is at risk, and how to migrate safely.
How to Block API Requests and Simulate Failures in Chrome During Development
Two practical methods for testing how your app handles API failures in Chrome: DevTools request blocking for hard stops, and header manipulation to trigger server-side error responses.
How to Override HTTP Response Headers in Chrome (No Proxy Required)
Test Cache-Control, CORS, and CSP behavior in Chrome by overriding response headers directly in the browser — no proxy, no backend changes, no Fiddler setup required.
How to Switch Between API Environments in Chrome (Dev, Staging, Prod)
Stop editing code or swapping browser profiles to switch between dev, staging, and production. HeaderSnap profiles let you switch API environments with one click.
HTTP Security Headers: The Complete Audit Checklist for 2026
A complete security headers audit checklist covering the 10 headers every production site needs: CSP, HSTS, X-Frame-Options, COOP, COEP, and more. With HeaderSnap.
How to Debug Redirect Loops and 301/302 Issues Using HTTP Headers in Chrome
Redirect loops and misfiring 301/302 redirects are diagnosable through headers. This guide walks through inspecting Location, Set-Cookie, and Strict-Transport-Security headers to find the root cause — and using header overrides to confirm it.
How to Test Localization and Internationalization Using Accept-Language Headers
Test localization and i18n without changing browser settings. Learn how to set Accept-Language headers like fr-FR, zh-CN, and en-US to simulate regional behavior during development.
HeaderSnap Collects Zero Data From Your Browser
Here's exactly what HeaderSnap stores, where it stores it, and what you can independently verify — no analytics, no telemetry, no external server calls.
Why HeaderSnap Is the Most Trustworthy Header Editor for Developers in 2026
The Chrome extension ecosystem is broken. 900,000+ developers hit by malicious extensions this quarter. For API developers who need an HTTP header editor, here's what separates trustworthy tools from risky ones.
Postman's 2026 Pricing Crisis: Why Developers Are Leaving — and Not Coming Back
In 2026, Postman removed free team collaboration and set a $23/user/month floor. But the developer backlash isn't really about money. It's about a pattern — and what it signals about where developer tooling is heading.
The $3.8B API Testing Market is Shifting Toward Open Source — What That Means for Your Team
The API testing market is projected to reach $3.8B in 2026, but the real story is where adoption is going: free, open-source tools are consolidating market share as enterprise pricing pushes developers toward lighter alternatives.
Content-Type Header Errors: How to Debug 415 Unsupported Media Type
415 Unsupported Media Type and 400 Bad Request from wrong Content-Type headers are frustrating. Here's a practical debugging workflow using header injection to find the fix fast.
Your ChatGPT Chrome Extension Might Be Spying on You — Here's What Developers Should Use Instead
900k+ developers had their ChatGPT, Claude, and DeepSeek conversations stolen by fake AI extensions — ones with Google's Featured badge. Here's what happened and how to protect yourself.
How to Verify Your Security Headers Are Actually Working (HSTS, CSP, X-Frame-Options)
Checking security headers are present isn't enough. Here's how to verify HSTS enforces HTTPS, CSP blocks violations, X-Frame-Options prevents iframe embedding, and X-Content-Type-Options stops MIME sniffing.
900K Developers Had Their AI Conversations Stolen by Fake Chrome Extensions
Two malicious Chrome extensions with Google's 'Featured' badge harvested ChatGPT, Claude, and DeepSeek conversations from 900k+ users. Here's how the attack worked — and how to evaluate whether a Chrome extension can actually be trusted.
How to Debug CORS Errors in Chrome (and Work Around Them Without Touching the Server)
CORS errors in Chrome are common and confusing. Here's how to diagnose them in DevTools and unblock your testing without waiting for a server change.
CORS Debugging Tools Compared: HeaderSnap vs ModHeader vs Requestly vs Chrome DevTools
Comparing the four most common tools developers use for CORS debugging. Which one is fastest for iterative testing, which comes with baggage, and which does the job cleanly.
How to Debug CORS Preflight Requests (OPTIONS) in Chrome
CORS preflight failures are invisible until you know where to look. This guide shows how to find the OPTIONS request in Chrome DevTools, read the exact error, and use header injection to isolate the problem.
How to Fix CORS in Local Development Without Touching Your Backend
CORS errors blocking your local dev workflow? Inject the right response headers directly in Chrome with HeaderSnap — no backend changes, no proxy, no config files.
Fiddler Alternatives for Mac Developers
Fiddler is Windows-first. If you're on a Mac and need HTTP debugging or header modification, here are your actual options.
Header Profiles for Multi-Environment Development (Staging, QA, Production)
Stop juggling header rules manually across environments. HeaderSnap profiles let you maintain a separate set of rules for staging, QA, and production — switch with one click.
How to Test JWT and OAuth2 Flows in Chrome (Without a Test Client)
Debugging JWT and OAuth2 auth flows directly in Chrome. How to inspect tokens, test Authorization headers, and simulate auth states with HeaderSnap — without setting up Postman or a separate test client.
ShotBird Malware Proves It Again: How to Evaluate Whether a Chrome Extension Is Safe
The ShotBird extension was sold to a malicious actor and began pulling instructions from a C&C server within days. Here's why this keeps happening — and what to actually check before trusting any Chrome extension with your network traffic.
Debug API Rate Limiting With Custom Headers (No Backend Changes Needed)
How to use custom request headers to test and debug API rate limiting behavior — without backend changes, proxy setup, or writing scripts. Practical guide for developers and QA teams.
How to Debug 401 and 403 Errors Using HTTP Headers
401 and 403 errors look similar but mean different things. This guide shows a practical workflow to isolate auth failures using header injection — so you know exactly what's broken before touching your code.
How to Test GraphQL APIs with Custom Authorization Headers in Chrome
Most GraphQL tutorials assume Postman or Apollo Studio. Here's how to inject Authorization: Bearer tokens directly into Chrome requests — no separate tool needed — using HeaderSnap.
Complete Guide to Editing HTTP Request Headers (For QA and Frontend Developers)
A complete guide to editing HTTP request headers in Chrome — what headers are, which ones matter for QA and frontend work, and how to use a browser extension to modify them without touching your codebase.
Modify User-Agent Headers in Chrome: The QA Engineer's Handbook
A practical guide for QA engineers on modifying the User-Agent header in Chrome — why it matters, what you can test, and how to set up persistent rules without DevTools.
Requestly Just Added AI. Here's Why Some Teams Are Looking for Something Simpler.
Requestly launched AI-powered test authoring. For developers who just need to inject a header and move on, here's why a focused alternative might serve you better.
Requestly Was Acquired by BrowserStack: What It Means for HTTP Header Testing
Requestly was acquired by BrowserStack in May 2025. If you chose Requestly for its independence and open-source credibility, here's what the acquisition means for HTTP header testing.
Chrome DevTools Header Overrides vs. Browser Extensions: Which Is Right for Your Workflow?
Chrome DevTools has a header override feature — but it's session-only and buried. Here's when to use DevTools vs. a dedicated browser extension like HeaderSnap.
How to Test API Authentication Headers Without Postman
A practical guide to Bearer token testing, JWT header injection, and OAuth header validation using a Chrome extension — no Postman required.
Why Development Teams Are Abandoning Postman's $23/User Plans in 2026 (And What They're Using Instead)
Postman removed free team collaboration in 2026, forcing teams to $23/user/month or $19/user/month annually. Here's what developers are actually switching to — and what fits different workflows.
How to Debug CORS Errors in Local Development
CORS errors blocking your local dev workflow? This guide explains what CORS actually is, why it bites hardest in local development, and how to diagnose the exact problem — including testing with custom request headers.
HTTP Header Debugging Guide for API Developers
How to add, override, and remove HTTP request headers while debugging API integrations — without spinning up a proxy. Practical guide for API developers and QA engineers.
Best ModHeader Alternatives in 2026 (That Don't Have the Adware Problem)
ModHeader's adware behavior and declining reviews are pushing developers to look elsewhere. Here are the best HTTP header editor alternatives — honest, feature-by-feature.