apache/httpd
Nov 2024 – Sep 2025
10 Months active
Languages Used
CPythonTextApache ConfigurationMarkdown
Technical Skills
HTTP/2Network ProtocolsServer ConfigurationTestingACME protocolApache HTTP Server Module Development
Stefan Eissing
PROFILE
Stefan Eissing
Over ten months, Stefan Eissing enhanced the apache/httpd repository by developing and refining core features in HTTP/2 and certificate management modules. He implemented robust ACME protocol support and advanced mod_md’s automation for certificate issuance, using C and Python to improve error handling, logging, and cross-version compatibility. Stefan addressed reliability and performance by fixing HTTP/2 connection logic, optimizing proxying, and introducing detailed performance metrics. His work included targeted bug fixes, such as correcting string handling for APR compatibility and restoring documentation, ensuring maintainability. These contributions deepened the reliability, security, and observability of Apache HTTP Server deployments in production environments.
Overall Statistics
Feature vs Bugs
44%Features
Repository Contributions
25Total
Bugs
10
Commits
25
Features
8
Lines of code
3,403
Activity Months10
Your Network
625 people
Work History
September 2025
1 Commits
Sep 1, 2025Month: 2025-09 — Apache httpd (mod_md) monthly review focused on robustness and compatibility improvements in string handling, plus targeted bug fix and alignment with the mod_md GitHub repository.
1 Commits
Sep 1, 2025Month: 2025-09 — Apache httpd (mod_md) monthly review focused on robustness and compatibility improvements in string handling, plus targeted bug fix and alignment with the mod_md GitHub repository.
September 2025
August 2025
6 Commits • 3 Features
Aug 1, 2025August 2025 performance overview for apache/httpd: Delivered robust HTTP/2 error handling enhancements, advanced mod_md 2.6.x renewal features (ACME ARI support, adjusted retry logic, and Tailscale removal), improved build/documentation traceability, and completed critical bug fixes. These changes improve reliability, reduce renewal traffic bursts, and streamline release processes.
August 2025
6 Commits • 3 Features
Aug 1, 2025August 2025 performance overview for apache/httpd: Delivered robust HTTP/2 error handling enhancements, advanced mod_md 2.6.x renewal features (ACME ARI support, adjusted retry logic, and Tailscale removal), improved build/documentation traceability, and completed critical bug fixes. These changes improve reliability, reduce renewal traffic bursts, and streamline release processes.
July 2025
1 Commits
Jul 1, 2025July 2025: Focused bug fix in HTTP/2 log2 calculations across httpd's HTTP/2 modules to stabilize push diaries and proxy window sizing. Implemented unsigned integer handling in log2 paths to prevent incorrect sizing, improving reliability of HTTP/2 proxying and push operations.
1 Commits
Jul 1, 2025July 2025: Focused bug fix in HTTP/2 log2 calculations across httpd's HTTP/2 modules to stabilize push diaries and proxy window sizing. Implemented unsigned integer handling in log2 paths to prevent incorrect sizing, improving reliability of HTTP/2 proxying and push operations.
July 2025
June 2025
1 Commits
Jun 1, 2025June 2025 — Apache httpd (mod_md) documentation fix delivered. Key features delivered: Documentation restoration of the MDActivationDelay directive in mod_md to fill a gap in user-facing configuration guidance. Major bugs fixed: Restored the MDActivationDelay directive documentation to address missing guidance. Overall impact and accomplishments: Improves configuration reliability for mod_md users, reduces ambiguity, and supports smoother adoption; maintains alignment with module capabilities and documentation standards. Technologies/skills demonstrated: Git-based version control, focused documentation work, mod_md configuration semantics, Apache httpd module ecosystem, cross-repo documentation alignment.
June 2025
1 Commits
Jun 1, 2025June 2025 — Apache httpd (mod_md) documentation fix delivered. Key features delivered: Documentation restoration of the MDActivationDelay directive in mod_md to fill a gap in user-facing configuration guidance. Major bugs fixed: Restored the MDActivationDelay directive documentation to address missing guidance. Overall impact and accomplishments: Improves configuration reliability for mod_md users, reduces ambiguity, and supports smoother adoption; maintains alignment with module capabilities and documentation standards. Technologies/skills demonstrated: Git-based version control, focused documentation work, mod_md configuration semantics, Apache httpd module ecosystem, cross-repo documentation alignment.
May 2025
2 Commits
May 1, 2025May 2025 focused on stabilizing core HTTP and MD features for apache/httpd through targeted fixes that boost reliability, performance, and security. Key work includes correcting H2WindowSize handling and session/multiplexing logic for HTTP/2, and enhancing TLS-ALPN-01 challenge support and status output formatting in MD, with related version upgrades. These changes reduce risk of incorrect window sizing, improve multiplexing efficiency, support multiple MDPrivateKeys (EC and RSA), and fix status page clarity. Overall, the month delivered measurable improvements in connection throughput, TLS challenge reliability, and operator UX, enabling smoother deployments and fewer incidents.
2 Commits
May 1, 2025May 2025 focused on stabilizing core HTTP and MD features for apache/httpd through targeted fixes that boost reliability, performance, and security. Key work includes correcting H2WindowSize handling and session/multiplexing logic for HTTP/2, and enhancing TLS-ALPN-01 challenge support and status output formatting in MD, with related version upgrades. These changes reduce risk of incorrect window sizing, improve multiplexing efficiency, support multiple MDPrivateKeys (EC and RSA), and fix status page clarity. Overall, the month delivered measurable improvements in connection throughput, TLS challenge reliability, and operator UX, enabling smoother deployments and fewer incidents.
May 2025
March 2025
6 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for apache/httpd focusing on HTTP/2 features, reliability, and maintenance. Delivered key HTTP/2 robustness and configurability improvements via mod_md 2.0.30, including improved header handling, timeout behavior, and a new H2MaxHeaderBlockLen directive. Implemented HTTP/2 reliability fixes such as correct 304 handling from mod_cache, restoration of stable backend detection in mod_proxy_http2, and enhanced logging for HTTP/2 session errors. Completed maintenance tasks to increment the versioning counter and fix documentation typos to reflect mod_http2 2.0.30. These changes collectively improve performance, reliability, observability, and release accuracy, delivering tangible business value by reducing client hangs, stabilizing backend interactions, and improving deployability.
March 2025
6 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for apache/httpd focusing on HTTP/2 features, reliability, and maintenance. Delivered key HTTP/2 robustness and configurability improvements via mod_md 2.0.30, including improved header handling, timeout behavior, and a new H2MaxHeaderBlockLen directive. Implemented HTTP/2 reliability fixes such as correct 304 handling from mod_cache, restoration of stable backend detection in mod_proxy_http2, and enhanced logging for HTTP/2 session errors. Completed maintenance tasks to increment the versioning counter and fix documentation typos to reflect mod_http2 2.0.30. These changes collectively improve performance, reliability, observability, and release accuracy, delivering tangible business value by reducing client hangs, stabilizing backend interactions, and improving deployability.
February 2025
2 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for apache/httpd development focused on delivering observable improvements in security, reliability, and performance through targeted feature work and bug fixes. Implemented enhanced ACME-based certificate management via Mod_md and added robust per-request timing in HTTP/2 for better performance visibility.
2 Commits • 2 Features
Feb 1, 2025February 2025 monthly summary for apache/httpd development focused on delivering observable improvements in security, reliability, and performance through targeted feature work and bug fixes. Implemented enhanced ACME-based certificate management via Mod_md and added robust per-request timing in HTTP/2 for better performance visibility.
February 2025
January 2025
2 Commits • 1 Features
Jan 1, 2025January 2025 (apache/httpd): Implemented reliability enhancements for certificate issuance (mod_md) and stabilized HTTP/2 test behavior. This work improves domain verification resilience, observability during certificate orders, and test reliability across curl versions, lowering incident risk and accelerating debugging and deployments.
January 2025
2 Commits • 1 Features
Jan 1, 2025January 2025 (apache/httpd): Implemented reliability enhancements for certificate issuance (mod_md) and stabilized HTTP/2 test behavior. This work improves domain verification resilience, observability during certificate orders, and test reliability across curl versions, lowering incident risk and accelerating debugging and deployments.
December 2024
3 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for apache/httpd. Focused on stabilizing the test suite, delivering a quality Mod_md 2.4.29 release, and improving operational visibility. Achievements centered on reducing CI flakiness, ensuring robust HTTP-01 handling, and polishing server-status and OCSP logging.
3 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for apache/httpd. Focused on stabilizing the test suite, delivering a quality Mod_md 2.4.29 release, and improving operational visibility. Achievements centered on reducing CI flakiness, ensuring robust HTTP-01 handling, and polishing server-status and OCSP logging.
December 2024
November 2024
1 Commits
Nov 1, 2024Month: 2024-11 — Stabilized Mod_http2 behavior under reset scenarios in apache/httpd. Implemented a keepalive timeout fix for reset requests, adding logic to count failed RST'ed requests to ensure connections honor the keepalive timeout after an initial request failure. Included regression tests validating the fix. This work improves reliability of persistent connections and reduces dropped requests under reset traffic, contributing to better user experience in high-load scenarios.
November 2024
1 Commits
Nov 1, 2024Month: 2024-11 — Stabilized Mod_http2 behavior under reset scenarios in apache/httpd. Implemented a keepalive timeout fix for reset requests, adding logic to count failed RST'ed requests to ensure connections honor the keepalive timeout after an initial request failure. Included regression tests validating the fix. This work improves reliability of persistent connections and reduces dropped requests under reset traffic, contributing to better user experience in high-load scenarios.
Activity
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Quality Metrics
Correctness88.8%
Maintainability88.4%
Architecture87.2%
Performance80.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
Apache ConfigurationCMarkdownPythonText
Technical Skills
ACME ProtocolACME protocolApache HTTP ServerApache HTTP Server Module DevelopmentApache HTTP Server module developmentApache modulesAutomationBackend DevelopmentBug FixingC ProgrammingC programmingCachingCertificate ManagementConfiguration ManagementConfiguration management
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