https://bugdays.com/guides/ Practical field guides for payload encoding, JVM diagnostics, APIs, certificates, databases, and developer workflows. en-us https://bugdays.com/guides/diagnose-kafka-consumer-lag-stuck-partition/ https://bugdays.com/guides/diagnose-kafka-consumer-lag-stuck-partition/ Thu, 24 Sep 2026 16:00:00 GMT Kafka consumer diagnostics Compare committed offsets with partition ends, inspect group members and assignments, and examine the records around a stuck position before changing offsets. https://bugdays.com/guides/browse-kafka-messages-by-offset-time/ https://bugdays.com/guides/browse-kafka-messages-by-offset-time/ Thu, 24 Sep 2026 16:00:00 GMT Kafka message inspection Read an exact Kafka offset range or start at a UTC timestamp, inspect key and headers, and understand retention and compaction gaps. https://bugdays.com/guides/replay-kafka-messages-between-topics/ https://bugdays.com/guides/replay-kafka-messages-between-topics/ Thu, 24 Sep 2026 16:00:00 GMT Kafka message replay Copy a Kafka record or bounded offset range to the same or another cluster, preserving key, value, headers, and partition order where possible. https://bugdays.com/guides/check-tls-certificate-chain-any-port/ https://bugdays.com/guides/check-tls-certificate-chain-any-port/ Wed, 16 Sep 2026 16:00:00 GMT TLS certificates and service diagnostics Inspect the certificate chain a live HTTPS, Kafka SSL, LDAPS, SMTPS, IMAPS, or raw TLS service presents; diagnose expiry, SAN mismatch, SNI, trust, and missing intermediates. https://bugdays.com/guides/dns-lookup-public-vs-system-resolver/ https://bugdays.com/guides/dns-lookup-public-vs-system-resolver/ Wed, 16 Sep 2026 16:00:00 GMT DNS and network diagnostics Check A, AAAA, CNAME, MX, TXT, NS, SOA, SRV, CAA, and PTR records; understand split-horizon DNS and forward-confirm a reverse DNS hostname. https://bugdays.com/guides/ip-address-lookup-isp-asn-reverse-dns/ https://bugdays.com/guides/ip-address-lookup-isp-asn-reverse-dns/ Tue, 15 Sep 2026 16:00:00 GMT IP and network investigation Learn what an IP address lookup can reveal about an ISP, ASN, network owner, approximate location, reverse DNS, and cloud provider—and what it cannot prove. https://bugdays.com/guides/identify-cloud-hosting-ips-in-access-logs/ https://bugdays.com/guides/identify-cloud-hosting-ips-in-access-logs/ Tue, 15 Sep 2026 16:00:00 GMT Network and bot investigation Investigate access-log IPs against cloud provider feeds, hosting ASN prefixes, CDN networks, and published crawler ranges without mistaking infrastructure for intent. https://bugdays.com/guides/test-grpc-api-proto-metadata-streaming/ https://bugdays.com/guides/test-grpc-api-proto-metadata-streaming/ Mon, 14 Sep 2026 16:00:00 GMT gRPC and APIs A practical gRPC testing workflow: load a proto contract, choose a method, build protobuf data from JSON, send metadata, inspect trailers, and debug status codes. https://bugdays.com/guides/grpc-web-vs-native-grpc-browser-testing/ https://bugdays.com/guides/grpc-web-vs-native-grpc-browser-testing/ Mon, 14 Sep 2026 16:00:00 GMT gRPC and browsers Choose the correct browser transport for a gRPC service, understand when gRPC-Web works directly, and test native HTTP/2 gRPC through a local bridge. https://bugdays.com/guides/soap-api-authentication-basic-ws-security-mtls/ https://bugdays.com/guides/soap-api-authentication-basic-ws-security-mtls/ Mon, 14 Sep 2026 16:00:00 GMT SOAP and security Identify which SOAP authentication layer a service expects, test HTTP credentials safely, recognize WS-Security headers, and separate mTLS failures from SOAP faults. https://bugdays.com/guides/decode-base64-gzip-to-json/ https://bugdays.com/guides/decode-base64-gzip-to-json/ Sun, 06 Sep 2026 16:00:00 GMT Payload decoding Decode a Base64 GZip string into readable JSON, understand the H4sI prefix, and share a working example that opens directly in the browser tool. https://bugdays.com/guides/read-java-thread-dump-find-deadlock/ https://bugdays.com/guides/read-java-thread-dump-find-deadlock/ Sat, 05 Sep 2026 16:00:00 GMT JVM diagnostics A practical, evidence-first method for reading jstack and jcmd output, tracing monitor ownership, confirming deadlocks, and separating ordinary waits from incidents. https://bugdays.com/guides/pem-vs-der-vs-cer-vs-p7b-certificate-formats/ https://bugdays.com/guides/pem-vs-der-vs-cer-vs-p7b-certificate-formats/ Sat, 05 Sep 2026 16:00:00 GMT TLS and certificates Identify common X.509 certificate formats, inspect their contents, convert them safely with OpenSSL, and avoid confusing filename extensions with encodings. https://bugdays.com/guides/test-soap-api-from-wsdl-soap-11-vs-12/ https://bugdays.com/guides/test-soap-api-from-wsdl-soap-11-vs-12/ Sat, 05 Sep 2026 16:00:00 GMT SOAP and APIs Turn a WSDL operation into a working request, choose the right SOAP version and headers, interpret faults, and recognize browser CORS limitations. https://bugdays.com/guides/sql-ddl-to-er-diagram-data-dictionary/ https://bugdays.com/guides/sql-ddl-to-er-diagram-data-dictionary/ Sat, 05 Sep 2026 16:00:00 GMT Database documentation Extract a schema-only database definition, visualize foreign-key relationships, add useful annotations, and export documentation without connecting another service. https://bugdays.com/guides/convert-terminal-table-to-excel/ https://bugdays.com/guides/convert-terminal-table-to-excel/ Sat, 05 Sep 2026 16:00:00 GMT Terminal productivity Turn ASCII pipes, Unicode box drawing, PostgreSQL results, or aligned console output into editable Excel, CSV, HTML, Word, and printable tables. https://bugdays.com/guides/gzip-base64-python-nodejs/ https://bugdays.com/guides/gzip-base64-python-nodejs/ Sun, 06 Sep 2026 16:00:00 GMT Encoding recipes Compress UTF-8 text to Base64 GZip in Python and Node.js, decode it across languages, and compare the results with a runnable browser example. https://bugdays.com/guides/fix-base64-gzip-decode-errors/ https://bugdays.com/guides/fix-base64-gzip-decode-errors/ Sun, 06 Sep 2026 16:00:00 GMT Decoding troubleshooting Diagnose invalid Base64, incorrect GZip headers, truncated payloads, and unreadable output. Compare your input with a working, shareable example.