ListOfErrors
Advanced HTTP Request and Response Header Viewer
Caching Tutorial for Webmasters
If you examine the preferences dialog of any modern Web browser (like Internet Explorer, Safari or Mozilla), you'll probably notice a 'cache' setting. This lets you set aside a section of your computer's hard disk to store representations that you've seen, just for you. The browser cache works according to fairly simple rules. It will check to make sure that the representations are fresh, usually once a session (that is, the once in the current invocation of the browser).
Advanced HTTP Redirection
Learn about the 7 different HTTP response codes specifically reserved for redirection. 301, 302, 303, 304, 305, and 307.
HTTP Status Codes and Htaccess ErrorDocuments
There are a total of 57 HTTP Status Codes recognized by the Apache Web Server. Wouldn't you like to see what all those headers and their output, ErrorDocuments look like?
27 Request Methods for Apache rewritecond htaccess
Notes from Apache HTTPD Source Code
thought I'd take a break from coding and post about how open-source is such a great tool for finding the best answers to the toughest questions,
/** is the status code informational */ #define ap_is_HTTP_INFO(x) (((x) >= 100)&&((x) < 200)) /** is the status code OK ?*/ #define ap_is_HTTP_SUCCESS(x) (((x) >= 200)&&((x) < 300)) /** is the status code a redirect */ #define ap_is_HTTP_REDIRECT(x) (((x) >= 300)&&((x) < 400)) /** is the status code a error (client or server) */ #define ap_is_HTTP_ERROR(x) (((x) >= 400)&&((x) < 600)) /** is the status code a client error */ #define ap_is_HTTP_CLIENT_ERROR(x) (((x) >= 400)&&((x) < 500)) /** is the status code a server error */ #define ap_is_HTTP_SERVER_ERROR(x) (((x) >= 500)&&((x) < 600)) /** is the status code a (potentially) valid response code? */ #define ap_is_HTTP_VALID_RESPONSE(x) (((x) >= 100)&&((x) < 600))
OpenSearch description document
Web Development Glossary
Request Method Security Scanner
FastCGI on DreamHost
Using FastCGI on DreamHost and .htaccess
HTTP Status Codes
This is a big update from the last time I looked into this, when I enumerated 57 Status Codes that Apache 2.x was capable of handling. This list contains 83 Status Codes recognized by Apache. I compiled the latest 2.4.4 Apache in order to view the actual codes sent by a live server.. very cool. You can read about the newest HTTP Status Codes in RFC 6585.
Securing php.ini and php.cgi with .htaccess
If you have a php.cgi or php.ini file in your /cgi-bin/ directory or other pub directory, try requesting them from your web browser. If your php.ini shows up or worse you are able to execute your php cgi, you'll need to secure it ASAP. This shows several ways to secure these files, and other interpreters like perl, fastCGI, bash, csh, etc.
PHP fsockopen for FAST DNS lookups over UDP
While reading up on gethostbyaddr on PHP.net, I saw a nice idea for using fsockopen to connect over UDP port 53 to any Public DNS server, like Google DNS 8.8.8.8, and sending the reverse addr lookup in oh about 100 bytes, then getting the response in oh about 150 bytes! All in less than a second. This is how/why to read/write data directly to the wire! This would be extremely valuable for use in things like my online header tool because it's faster than any other method. As usual, I went a bit overboard optimizing it to be lean and fast.
HTTP Packet Capturing to debug Apache
This article is a quick and easy HowTo detailing the use of Wireshark or another network sniffing program to debug your Apache .htaccess or httpd.conf files.
Debugging HTTP Cache Headers with Wireshark
Respond with 200 OK for 404 Not Found
What if you'd like to send a 200 OK response instead of the default 404 Not Found response using Apache .htaccess files or httpd.conf? One use would be to make sure upstream caches cache any request on an api server, as 404's are not cached.
Apache Variable Fun in htaccess
Server and Environment Variables are used by The Apache HTTP Server by provides a mechanism for storing information. This information can be used to control various operations such as logging or access control.
Fsockopen Magic
PHP's fsockopen function lets you open an Internet or Unix domain socket connection for connecting to a resource, and is one of the most powerful functions available in the php language.
Apache Compression, Vary, mod_deflate
Apache Web Server Speed Configuration Hacks
Apache server performance can be improved by adding additional hardware resources such as RAM, faster CPU, etc.COMPUTER SECURITY TOOLBOX
List of mainly obscure security software geared more for the master pentester. These are mostly for unix, bsd, and mac and many are difficult to install and setup (require custom servers, inside access points, obscure libraries). Only programs that output data are included, so no actual exploits or anything. Most of these output extremely useful albeit extremely technical information.Instruct Search Engines to come back to site after you finish working on it
Nifty SEO tip to get Search Engine Bots to check your site every hour until you finish working on it and tell them you are finished.
htpasswd Generator
SEO Secrets of AskApache.com
Learn how in a year, with no previous blogging experience this blog was able to rank so high in search engines and achieve 15,000 unique visitors every day. Uses combination of tricks and tips from throughout AskApache.com for Search Engine Optimization.
Internet Census 2012 – Port scanning using insecure embedded devices – Carna Botnet
While playing around with the Nmap Scripting Engine (NSE) we discovered an amazing number of open embedded devices on the Internet. Many of them are based on Linux and allow login to standard BusyBox with empty or default credentials. We used these devices to build a distributed port scanner to scan all IPv4 addresses. These scans include service probes for the most common ports, ICMP ping, reverse DNS and SYN scans. We analyzed some of the data to get an estimation of the IP address usage.
Optimizing Servers and Processes for Speed with ionice, nice, ulimit
To prepare for several upcoming articles on AskApache that are focused on optimizing Servers and Sites from a server admin level, here is an article to introduce the main tools that we will be using. These tools are used to optimize CPU time for each process using nice and renice, and other tools like ionice are used to optimize the Disk IO, or Disk speed / Disk traffic for each process. Then you can make sure your mysqld and httpd processes are always fast and prioritized.
Google: Let’s Make the Web Faster
Speed Tips: Turn Off ETags
By removing the ETag header, you disable caches and browsers from being able to validate files, so they are forced to rely on your Cache-Control and Expires header.
3 Ways to Serve PDF Files using Htaccess Cookies, Headers, Rewrites
FYI, using the Mod_Rewrite Variables Cheatsheet makes this example, and all advanced .htaccess code easier to understand. This demo lets you set a cookie with 1 of 3 values, then you just request the pdf file with a normal link click and get 1 of 3 different responses. This is accomplished with a nice bit of .htaccess code.
Set PDF Viewing Mode - Make a selection, then click the view pdf button.
Inline Download Save As View PDF using selected mode »
Mod_Rewrite Variables Cheatsheet
We've figured out what mod_rewrite variables look like, a cheatsheet of the actual value.
Windows
Running a Reverse Proxy in Apache
Hack WP-Cache for Maximum Speed
If you desire SPEED from your WordPress blog, the #1 speed improvement comes from using the WP-Cache Plugin. If you still desire SPEED after installing the Plugin, you can modify the WP-Cache Plugin code to make your blog even faster!
THE Ultimate Htaccess
.htaccess is a very ancient configuration file for web servers, and is one of the most powerful configuration files most webmasters will ever come across. This htaccess guide shows off the very best of the best htaccess tricks and code snippets from hackers and server administrators.
You've come to the right place if you are looking to acquire mad skills for using .htaccess files!
Apache SSL in htaccess examples
SSLOptions +StrictRequire
SSLRequireSSL
SSLRequire %{HTTP_HOST} eq "google.com"
ErrorDocument 403 https://google.com
Some of the Ins and Outs of using SSL Connections with Apache.
Troubleshooting Apache .htaccess Authentication
Apache Web Server users have problems getting Apache Authentication/password-protection in htaccess working, this is a troubleshooting guide to get Password Protection working!
301 Redirect Cheatsheet
Ultimate Redirect Cheatsheet for multiple programming languages. Redirecting Users with Javascript redirect, meta refresh redirect, and php redirect, also htaccess methods, python, coldfusion, asp, perl, etc.
Apache Directives and Modules on DreamHost
Apache .htaccess Directives and Loaded Modules allowed on DreamHost Apache Server 2 Setups.
