In this episode of The API Podcast, Lucas and Luna explore how webhooks enable real-time, event-driven communication between APIs. They break down the difference between polling and push-based architectures, explain how webhooks work under the hood with HTTP callbacks, and discuss real-world use cases like GitHub notifications and Stripe payment events. The hosts also cover webhook security signatures, idempotency challenges, and the trade-offs compared to WebSockets and GraphQL subscriptions. Perfect for developers building modern integrations.

#Webhooks #EventDrivenArchitecture #APIs #REST #GraphQL #HTTPCallbacks #RealTimeData #DeveloperTools #Stripe #GitHub #Idempotency #WebhookSecurity #Technology #SoftwareEngineering #Integration #FexingoBusiness #BusinessPodcast #TheAPIPodcast

Keep every episode free: buymeacoffee.com/fexingo

In this episode, Lucas and Luna explore how API gateways act as a single entry point for managing traffic across microservices. They discuss real-world use cases like rate limiting, authentication, and routing with tools like Kong and AWS API Gateway. The hosts walk through how a gateway can simplify client interactions, enforce security policies, and provide observability without burdening individual services. They also touch on the trade-offs in terms of added latency and complexity. A must-listen for backend engineers and API designers looking to scale their architecture.

#API #APIGateway #Microservices #TrafficManagement #RateLimiting #Authentication #Kong #AWSAPIGateway #BackendEngineering #Scalability #ServiceMesh #Observability #TechPodcast #TheAPIPodcast #FexingoBusiness #BusinessPodcast #Technology #WebAPIs

Keep every episode free: buymeacoffee.com/fexingo

Lucas and Luna explain how HTTP conditional requests—using ETags and If-Modified-Since headers—let APIs avoid sending data that hasn't changed. They walk through a real example: a dashboard app polling a GitHub-style issues endpoint 60 times per minute. A 304 Not Modified response cuts bandwidth by 90% and reduces latency from 200ms to under 10ms. They also cover pitfalls like strong vs. weak validators, clock skew with timestamps, and why conditional requests are the unsung hero of RESTful API performance. No prior episode has focused on this specific caching mechanism.

#ConditionalRequests #ETag #IfModifiedSince #HTTPCaching #RESTAPI #APIPerformance #BandwidthOptimization #304NotModified #CacheValidation #WebPerformance #APIDesign #LatencyReduction #DeveloperTools #TechPodcast #TheAPIPodcast #FexingoBusiness #BusinessPodcast #Technology

Keep every episode free: buymeacoffee.com/fexingo

When an API tells you 'back off,' how long should you wait? This episode dives into the Retry-After header — the HTTP mechanism that lets rate-limited clients know exactly when to retry. Lucas and Luna walk through the two formats (seconds vs. HTTP-date), why the server's stated wait time matters more than the client's guess, and a real-world case from a major payment processor where ignoring Retry-After caused a 45-minute outage. They also cover the difference between 429 Too Many Requests and 503 Service Unavailable, and why modern API gateways like Kong and AWS API Gateway expose Retry-After in their default rate-limiting policies. If you're building or consuming APIs, this is the one header you shouldn't ignore.

#RetryAfter #APIHeaders #RateLimiting #HTTP429 #HTTP503 #APIDesign #GracefulRecovery #KongGateway #AWSAPIGateway #Stripe #BackoffStrategy #ResilientAPIs #WebDevelopment #Technology #FexingoBusiness #BusinessPodcast #APIPodcast #ModernWebAPIs

Keep every episode free: buymeacoffee.com/fexingo

Lucas and Luna dive into content negotiation — the HTTP mechanism that lets a single API endpoint serve JSON, XML, HTML, or even protobuf based on what the client requests. Using the GitHub API v3 as their primary case study, they walk through how the Accept header drives format selection, what happens when the server can't fulfill a request, and why versioning via content type is cleaner than URL-based versioning. They also touch on how Stripe uses vendor-specific media types for API versioning, and why the wildcard Accept header can cause subtle caching bugs. If you've ever wondered how the same endpoint returns different representations without breaking clients, this episode explains the mechanics and trade-offs in plain developer terms.

#ContentNegotiation #HTTPHeaders #RESTfulAPI #GitHubAPI #Stripe #MediaTypes #APIVersioning #JSON #XML #ProtocolBuffers #AcceptHeader #WebDevelopment #BackendEngineering #Technology #FexingoBusiness #BusinessPodcast #API #SoftwareArchitecture

Keep every episode free: buymeacoffee.com/fexingo

Episode 124 of The API Podcast explores error budgets, a concept from the DevOps and Site Reliability Engineering (SRE) world that helps teams decide how much downtime is acceptable. Lucas and Luna break down the math behind a 99.9% service level objective (SLO), how error budgets let developers ship features faster without breaking promises to users, and a real-world case from Google's early SRE implementation. If you've ever wondered why some APIs seem rock-solid while others break often, this episode explains the trade-off between innovation and stability.

#ErrorBudgets #SRE #DevOps #SLO #ServiceLevelObjective #API #Reliability #Velocity #Google #SiteReliabilityEngineering #BlamelessCulture #Technology #FexingoBusiness #BusinessPodcast #TheAPIPodcast #LucasAndLuna #Monitoring #IncidentResponse

Keep every episode free: buymeacoffee.com/fexingo

When an API returns a 429 Too Many Requests error, the best response isn't to retry immediately—it's to back off. Lucas and Luna break down the exponential backoff strategy, using real examples from the Stripe API and the 2024 GitHub outage. They explain how jitter prevents thundering herd problems, why Fibonacci backoff can outperform exponential in some cases, and how to set a reasonable cap. Listeners learn exactly how to implement backoff in their own integrations, complete with a concrete code walkthrough. This episode is essential reading for any developer building resilient API clients or managing third-party API rate limits.

#API #RateLimiting #ExponentialBackoff #Stripe #GitHub #Jitter #ThunderingHerd #Resilience #RetryStrategy #Programing #SoftwareEngineering #WebDevelopment #Technology #FexingoBusiness #BusinessPodcast #LucasAndLuna #APIResilience #BackoffStrategy

Keep every episode free: buymeacoffee.com/fexingo

In this episode, Lucas and Luna dive into optimistic locking — a concurrency control strategy that lets APIs handle multiple simultaneous writes without locking resources. They explore a real-world example from a popular collaborative editing tool and explain how version tokens (ETags) and conditional requests prevent data corruption. Lucas breaks down the trade-offs between optimistic and pessimistic locking, while Luna asks why most REST APIs default to the optimistic approach. By the end, you'll understand how this pattern powers everything from collaborative documents to inventory management systems.

#OptimisticLocking #ConcurrencyControl #RESTAPI #ETag #ConditionalRequests #HTTP #WebAPI #BackendEngineering #Database #ACID #ConflictResolution #Versioning #CollaborativeEditing #InventoryManagement #Technology #API Design #FexingoBusiness #BusinessPodcast

Keep every episode free: buymeacoffee.com/fexingo

In this episode, Lucas and Luna dive into WebSocket — the protocol that enables real-time, bidirectional communication between clients and servers. They explain how WebSocket differs from HTTP polling and server-sent events, using the example of a live sports ticker that pushes scores to thousands of users simultaneously. The hosts walk through the WebSocket handshake, frame structure, and how it maintains a persistent connection. They also discuss real-world trade-offs: why WebSocket is great for chat apps and live dashboards but overkill for simple request-response patterns. Lucas shares a concrete story about a startup that switched from HTTP polling to WebSocket and cut their server costs by 40 percent while reducing latency from two seconds to under 50 milliseconds. Luna challenges him on security considerations, and they cover the WSS protocol and origin checking. The episode closes with a look at WebSocket vs. gRPC streaming for microservice communication.

#WebSocket #BidirectionalStreaming #RealTimeAPI #HTTPPolling #ServerSentEvents #WSS #WebSocketHandshake #PersistentConnection #Latency #LiveSportsTicker #ChatApp #Startup #Microservices #gRPC #Security #OriginCheck #FexingoBusiness #BusinessPodcast

Keep every episode free: buymeacoffee.com/fexingo

Episode 120 of The API Podcast digs into schema evolution — how APIs change their data structures without breaking existing clients. Lucas walks through a real example from Stripe's API changelog, where adding a new field to a payment object required careful planning around defaults and null handling. Luna compares it to a painful migration she once dealt with at a startup that skipped versioning entirely. The hosts explain practical patterns like additive-only changes, using defaults for new fields, and the role of schema registries. They also touch on how GraphQL's type system makes some forms of evolution easier while introducing its own constraints. Specific takeaways: why removing a field is almost never safe, how to deprecate gracefully using sunset headers, and when to cut a new API version instead. By the end, listeners will understand the tradeoffs between flexibility and stability in API design.

#API #SchemaEvolution #BackwardCompatibility #REST #GraphQL #Stripe #APIDesign #DeveloperExperience #WebDevelopment #Microservices #TechPodcast #SoftwareEngineering #DataModeling #Versioning #Deprecation #APIVersioning #FexingoBusiness #BusinessPodcast

Keep every episode free: buymeacoffee.com/fexingo