How to Rewrite and Redirect API URLs Without Code Changes
Reroute any outgoing API request or video stream from one URL to another seamlessly. Perfect for pointing production apps to local mock servers or staging CDNs.
How to Modify Outgoing Request Payloads Using JSON Deep Merge
Inject test flags, override user IDs, or mutate nested parameters in outgoing POST and PUT bodies while preserving all other original fields.
How to Inject Custom Request Headers and Bearer Tokens
Add, replace, or strip HTTP request headers automatically. Ideal for injecting test JWT credentials, multi-tenant headers, or feature flags.
How to Mock API Responses with Synthetic JSON Payloads
Intercept any network call and return a custom synthetic JSON payload immediately without sending traffic to the remote backend.
How to Merge and Append New Fields into Real API Responses
Fetch the authentic response from your production server, then automatically overlay extra JSON fields onto the payload before handing it to your app.
How to Programmatically Transform API Responses with JavaScript
Run custom inline JavaScript functions on incoming response payloads. Sort arrays, calculate dynamic prices, or mock personalized user experiences.
How to Bypass CORS Errors and Modify Response Headers
Inject `Access-Control-Allow-Origin: *` and customize caching directives to test cross-origin APIs and inspect stale-while-revalidate behavior.
How to Simulate Network Latency and API Delays
Inject artificial delays (e.g. 1500ms, 3000ms) on individual API endpoints to test asynchronous race conditions and loading UI states.
How to Block Third-Party Requests, Analytics, and Trackers
Block outgoing requests matching specified domains, simulating network drops or testing application resilience when third-party services fail.
How to Simulate HTTP Error Codes (500, 401, 404, 503)
Flip successful 200 OK responses to 401 Unauthorized, 404 Not Found, 500 Internal Server Error, or 503 Service Unavailable to verify error handling.
How to Debug Smart TV Apps (Samsung Tizen, LG webOS, Android TV)
Include the 12KB ProxyCeptor SDK in your TV web application to intercept fetch and XHR traffic directly inside the web runtime with zero TV root cert installation.
How to Mock and Inspect Streaming Video Manifests (.m3u8, .mpd)
Reroute high-bitrate video streams to test CDNs or inject custom manifest tags to verify player playback recovery and stream fallback behavior.
How to Debug SonyLIV Godavari (GV1) Beacon Analytics
Track high-frequency video beacons, calculate Video Start Time (VST) metrics, and verify deep-merged analytics payloads in a dedicated streaming console.
How to Record and Replay Web Debugging Sessions with rrweb
Capture rolling DOM recordings alongside synchronized network requests and console errors, exporting everything into a standalone HTML replay player.
How to Share Proxy Rules Across Engineering Teams with Cloud Sync
Publish rules to cloud team workspaces so QA engineers, frontend developers, and remote contractors always use the latest API simulation sets.
How to Test Expired JWT Tokens and Session Timeout Flows
Force your authentication API to return 401 Unauthorized with token-expired payloads to verify that token refresh routines and logout modals fire properly.
How to Test Slow 3G and Flaky Mobile Network Resilience
Combine millisecond delays with probabilistic status flips to simulate real-world mobile network jitter and flaky cellular connections.
How ProxyCeptor Intercepts fetch, XHR, and sendBeacon Calls
A deep-dive into how ProxyCeptor combines Chrome declarativeNetRequest (DNR) with in-page JavaScript interception to modify traffic without breaking pages.
How to Export, Inspect, and Share HAR Network Traffic Logs
Export complete network traces in industry-standard HTTP Archive (.har) format for Jira bug reports, regression tracking, and performance audits.
How to Override API Responses Server-to-Server Using Proxy Forwarding
Route server-to-server HTTP calls through ProxyCeptor forwarder to apply active profile mocks, merges, and block rules without browser extensions.