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CODE FARM

HTTP Strict-Transport-Security

15 Oct 2021

The HTTP Strict-Transport-Security response header (often abbreviated as HSTS) lets a web site tell browsers that it should only be accessed using HTTPS, instead of using HTTP. 1. Syntax Strict-Transport-Security: max-age=<expire-time> Strict-Transport-Security: max-age=<expire-time>; includeSubDomains Strict-Transport-Security: max-age=<expire-time>; preload 2. Directives max-age=<expire-time> The time, in seconds, that the browser should remember that...
Network Router, Switch, Bridge and Hub

13 Oct 2021

1. Forwarding information base A forwarding information base (FIB), also known as a forwarding table or MAC table, is most commonly used in network bridging, routing, and similar functions to find the proper output network interface to which the input interface should forward a packet. It is a dynamic table...
Computer Network

25 Sep 2021

1. Computer network A computer network is a set of computers sharing resources located on or provided by network nodes. The computers use common communication protocols over digital interconnections to communicate with each other. These interconnections are made up of telecommunication network technologies, based on physically wired, optical, and wireless...
HTTP 3xx Redirect and NGINX Rewrite Directives

24 Sep 2021

Location The Location response header indicates the URL to redirect a page to. It only provides a meaning when served with a 3xx (redirection) or 201 (created) status response. In cases of redirection, the HTTP method used to make the new request to fetch the page pointed to by Location...
VPC and Cloud Computing

18 Sep 2021

What is a virtual private cloud (VPC)? A VPC is a public cloud offering that lets an enterprise establish its own private cloud-like computing environment on shared public cloud infrastructure. A VPC gives an enterprise the ability to define and control a virtual network that is logically isolated from all...
HTTP Caching and Conditional Requests

17 Sep 2021

The performance of web sites and applications can be significantly improved by reusing previously fetched resources. Web caches reduce latency and network traffic and thus lessen the time needed to display a representation of a resource. By making use of HTTP caching, Web sites become more responsive. 1. Different kinds...
Proxy Server and Forwarded HTTP Extensions

16 Sep 2021

Proxy Server Figure 1. Communication between two computers (shown in grey) connected through a third computer (shown in red) which acts as a proxy server. Bob does not know to whom the information is going, which is the reason that proxies can be used to protect privacy. In computer networking,...
Domain Name Resolver

15 Sep 2021

Domain Name A domain name is an identification string that defines a realm of administrative autonomy, authority or control within the Internet. Domain names are used in various networking contexts and for application-specific naming and addressing purposes. In general, a domain name identifies a network domain, or it represents an...
What is CORS and Same-Site

01 Sep 2021

1. Same-Origin Policy The same-origin policy is a critical security mechanism that restricts how a document or script loaded by one origin can interact with a resource from another origin. Web content’s origin is defined by the scheme (protocol), hostname (domain), and port of the URL used to access it....
PowerBI Report Server Extensions with CAS

18 Aug 2021

1. Prerequisites .NET Framework 4.8 Developer Pack Microsoft Visual Studio Community 2019 Version 16.10.4+ Microsoft Power BI Report Server - May 2021 SQL Server 2019 NET 5.0 SDK(Optional) How to Build .NET Project with CLI \# Open Developer Command Prompt for VS 2019 and goto the project directory, then type...
Designing Data-Intensive Applications

11 Feb 2021

Reliability: Hardware Faults Software Errors Human Errors Scalability: Load Parameters request per second to a web server ratio of reads and writes in a database Performance throughput response time ***Latency** and **response time** are often used synonymously, but they are not the same. The response time is what the client...
Greenplum 运维札记

18 Nov 2020

1. 模拟环境信息 Master: mdw Standby Master: smdw Segment Host: [smdw, sdw1] [gpadmin@mdw ~]$ gpstate -s 20201118:16:08:08:003865 gpstate:mdw:gpadmin-[INFO]:-Starting gpstate with args: -s 20201118:16:08:08:003865 gpstate:mdw:gpadmin-[INFO]:-local Greenplum Version: 'postgres (Greenplum Database) 6.4.0 build commit:564b89a8c6bef5e329a59f39dac438b13d9cb3fa' 20201118:16:08:08:003865 gpstate:mdw:gpadmin-[INFO]:-master Greenplum Version: 'PostgreSQL 9.4.24 (Greenplum Database 6.4.0 build commit:564b89a8c6bef5e329a59f39dac438b13d9cb3fa) on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 6.4.0, 64-bit...
Algorithms

18 Aug 2020

An algorithm is any well-defined computational procedure for solving a well-specified computational problem that takes some value, or set of values, as input and produces some value, or set of values, as output. For example, given the input sequence [31 41 59 26 41 58], a sorting algorithm returns as...
Alex Petrov - Database Internals

07 May 2020

Databases are modular systems and consist of multiple parts: a transport layer accepting requests, a query processor determining the most efficient way to run queries, an execution engine carrying out the operations, and a storage engine. The storage engine (or database engine) is a software component of a database management...
Golang Learning Notes

07 Apr 2020

1. Foramtting With Go we take an unusual approach and let the machine take care of most formatting issues. The gofmt program (also available as go fmt, which operates at the package level rather than source file level) reads a Go program and emits the source in a standard style...
6 - Kubernetes Monitoring

10 Feb 2020

Prometheus Architecture Data Model (TSDB) A time series is a series of data points indexed (or listed or graphed) in time order. Most commonly, a time series is a sequence taken at successive equally spaced points in time. Thus it is a sequence of discrete-time data. Prometheus fundamentally stores all...

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