This guide explains urllib2's info() and geturl() methods, demonstrates how to work with Openers and Handlers, and shows how to implement HTTP Basic Authentication with practical Python examples.
Learn how to use key Linux networking tools—including ifconfig, host, nslookup, route, and traceroute—to display interface details, query DNS, view routing tables, and trace packet paths, with practical examples, screenshots, and tips such as MAC address spoofing and interface listing.
This article walks through a real‑world Nginx 400 Bad Request incident, explaining how missing or malformed Host headers and added proxy headers caused the error, and provides step‑by‑step diagnostics, configuration comparisons, and the final fix of using the correct $host variable.
The article explores DevOps concepts, recounting personal experiences with legacy systems, the evolution of continuous integration and delivery, the promises and pitfalls of microservices, deployment challenges, orchestration tools, and modern container‑based solutions like Docker and Kubernetes, emphasizing a pragmatic path toward immutable infrastructure.
The Youku Tudou data team overhauled its video recommendation system by moving ranking from offline to online, detailing architectural changes, advantages, challenges, feature handling, offline evaluation, and model weight fusion to improve scalability and user experience.
This article explains how PHP, as a scripted language, is compiled to intermediate code and run by the Zend virtual machine, detailing the VM’s role, JIT compilation, execution stacks, php‑fpm workflow, and key questions about OpCache and configuration loading.
This article explains the principles of load balancing, distinguishes stateless service and stateful data balancing, describes DNS, hardware and software solutions such as F5, HAProxy, LVS, and GSLB, and illustrates real‑world implementations at Alibaba and Tencent while offering practical guidance on sharding, caching, and fault tolerance.
This article explains how to use the ajaxFileUpload jQuery plugin for asynchronous file uploads, detailing its syntax, configuration options, integration steps with HTML, JavaScript, and Java backend code, and provides practical notes on styling and compatibility.
This article examines less‑common mobile overlay patterns—half‑screen pages, ActionSheets, BottomSheets, and Popovers—explaining their use cases, design advantages, and best‑practice tips for iOS and Android applications.
This article defines overlay layers, compares dialog boxes, toasts, and snackbars, outlines their modal and non‑modal variants, usage scenarios, design tips, advantages, and drawbacks, helping designers choose the right temporary UI component for mobile and web applications.
This article walks through how the Samsung S3C2410 clocks are defined, linked to parent clocks, and finally registered in the Linux kernel via a chain of initialization functions, illustrating each step with source‑code excerpts and diagrams.
The article explains how a high‑traffic e‑commerce platform like Taobao relies on distributed storage, search engines, massive caching, load‑balancing, CDN, sophisticated advertising and analytics systems, all of which require large teams of top engineers to design, implement, and operate.
This article walks through Spark’s origins, its core RDD concept, how it improves on Hadoop’s MapReduce, the role of in‑memory processing, functional programming support, and the emergence of Spark SQL with DataFrames and the Catalyst optimizer.
StarCraft, a classic real‑time strategy game, has become a premier testbed for deep reinforcement learning and AI research, and Alibaba’s open‑source Gym StarCraft platform now bridges Python, TensorFlow, Keras and OpenAI Gym to simplify multi‑agent, macro‑strategy development and fair benchmarking.
This article provides a comprehensive overview of RocksDB, covering its origin, design goals, core architecture components, key features such as APIs, compression strategies, durability mechanisms, backup and replication support, as well as tooling, testing, and performance characteristics.
This article examines the internal implementation of the Android Picasso image‑loading library, detailing its singleton initialization, request creation, builder pattern usage, caching mechanisms, delayed loading, and the workflow of actions, handlers, and thread execution to illustrate how images are fetched and displayed.
This article outlines practical Linux‑based optimization techniques for MySQL, covering CPU power‑saving modes, NUMA and vm.swappiness settings, as well as mount options and I/O scheduler tweaks to maximize database throughput and stability.
The article explains how Python's urllib2 raises URLError and HTTPError, details their causes and attributes, and presents two practical approaches for catching and processing these HTTP exceptions to build more robust networked applications.
This article explains Oracle's dynamic sampling feature, outlines typical scenarios such as temporary tables and complex filters, presents real CRM case studies with misestimated cardinalities, demonstrates step‑by‑step solutions using DBMS_STATS commands, and shows how 12c enhancements dramatically improve estimation accuracy for complex queries.
The article shares the author’s experience transitioning from private to public and hybrid clouds at Lianjia, introduces a “third kind” of operations that blends traditional and internet‑based practices, and discusses containers, DNS‑based naming, and automation tools to build adaptable, cost‑effective infrastructure.
