bfcache with WebRTC: Avoiding Duplicate Connections on Return
Use pageshow.persisted and pagehide to pause connections, unregister listeners, reconcile on return, and opt out only when restoration cannot be made safe.
uCopy Technical Blog
Clear explanations for connections that work in real life · Page 2
Practical uCopy guides to WebRTC, P2P file transfer, STUN and TURN, LAN discovery, resumable transfers, screen sharing, privacy, and security.
WebRTCP2P transferSTUN / TURNPrivacy & security
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Blue-Green Deployment for Long-Lived Real-Time Connections
Run dual environments with protocol compatibility, connection draining, session directories, and staged traffic shifts so WebSocket deployments do not disconnect everyone.
A Browser Compatibility Matrix Based on Capabilities and Pairs
Build a matrix of browser major, desktop/mobile, permissions, codecs, DataChannel, and network capabilities while controlling combinatorial explosion by risk.
Collecting Browser Exceptions, Promise, Resource, and CSP Errors
Collect window errors, unhandled rejections, resource failures, CSP reports, and framework boundaries with normalization, deduplication, sampling, privacy cleaning, and reliable delivery.
Browser Storage Quotas: Estimate Is Advisory and Writes Still Fail
Use StorageManager estimates, persistence requests, headroom, chunk commits, and recoverable cleanup across private mode, low disk, and browser eviction.
The Browser Zero-Copy Boundary: Fewer Copies Is the Practical Goal
Trace copies through File.slice, ArrayBuffer, Workers, hashing, DataChannel, and receiver storage to design streaming reads, transferable objects, and bounded buffers.
Supporting 200 Percent Browser Zoom Without Losing Controls
Use reflow, relative units, container queries, and wrapping toolbars so connect, file, and screen controls remain complete at enlarged text and narrow effective viewports.
Cache Versioning and Cleanup Without Deleting Live Assets
Manage caches with manifest hashes, version names, activate cleanup, and a client compatibility window across growing blogs, failed installs, and old tabs.
Capability Tokens Authorize Actions, Not Merely Identity
Encode resource, action, audience, expiry, and constraints in unforgeable capability tokens for least-privilege screen viewing, one-file receive, and TURN quota.
Detecting CGNAT Signals Without Pretending Certainty
Combine local addresses, STUN mappings, 100.64/10, port behavior, and router information to identify carrier-grade NAT signals and set direct-connect expectations.
Circuit Breakers: Timeouts, Isolation, and Half-Open Probes
Set independent timeouts, concurrency bulkheads, and breaker states for credentials, databases, and regional services so one slow dependency cannot exhaust signaling workers.
Client Anomaly Scoring Without Permanent User Labels
Score connection frequency, repeated errors, target diversity, and resource use in short windows with explainable thresholds, decay, and review.
Clipboard API Permissions: Why Write Works While Read Fails
Compare secure contexts, transient activation, Permissions API, background tabs, and browser differences to design manual-paste fallback and explicit clipboard actions.
Clipboard and Rich-Text XSS Treat Pasted HTML as Hostile
Handle text/plain, text/html, images, and custom clipboard types with plain-text defaults, sanitization, Trusted Types, and validation on both peers.
Clustering Ten Thousand Client Errors into Actionable Problems
Cluster browser errors through source-map normalization, stack fingerprints, error codes, releases, and state stages while handling minification, noisy frames, and drift.
Rate-Limiting Connection Attempts Without Punishing Shared NATs
Rate-limit by device, target, account, anonymous session, and coarse network while distinguishing scans, mistyped codes, legitimate retries, and harassment after refusal.
Connection Consent That Blocks Harassment Without Repeated Prompts
Separate unknown first requests, verified-device recovery, new capability requests, and post-rejection retries with identity context, defaults, cooldown, and audit.
Instrumenting the Connection Funnel from Click to Usable DataChannel
Define stage events, duration, and terminal outcomes for discovery, request, consent, signaling, ICE, DTLS, DataChannel, and feature readiness.
Defining a Connection SLO Across Success, Latency, and Recoverability
Define connection success from user intent, exclude explicit refusal, impose a time limit, and use an error budget to guide releases and regional degradation.
Consistent Hashing for Session Routing Without Worshipping the Ring
Route device sessions with virtual nodes, weights, failure removal, and replicas while accounting for scaling movement, hot keys, and an authoritative directory.
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