Location where the Apache error log entries can be found in Ubuntu
user@server:~# less /var/log/apache2/error.log
Archive for the ‘General’ Category
Feb
03
2010
03
2010
SSL Error: Revocation information for the security certificate for this site is not available.
SSL Error: Revocation information for the security certificate for this site is not available. Do you want to proceed?
Solutions:
i) Install the root CA under Trusted Certificate Authority or,
ii) Add an exception to the browser filter not to check certificate revocation or,
iii) Programatically handle the SSL stream when request is made from the server
Feb
01
2010
01
2010
Choosing version control system (VCS): Git vs Subversion
Git
- Distributed repository system (adaptive work flow models)
- Source control taxonomy: DAG storage
- URI to git directory is where the repository is stored and it always has branches and tags
- Repository root folder contains a .git directory which maintains file history
- Scalability
- Faster, Efficient branching and merging
- License: Copyleft
Subversion (SVN)
- Centralized repository system
- Source control taxonomy: Delta storage
- URI to a subversion depository most commonly adopts /trunks, /branches and /tags directories
- Each folder maintains a .svn directory to store the file history
- Not efficient in scaling
- Not efficient in branching and merging
- License: Copyfree
Jan
20
2010
20
2010
PDF Split and Merge (pdfsam)
PDF Split and Merge (pdfsam) - an elegant tool that establishes the tasks stated in the name of the product.
pdfsam is distributed under GPL license and requires Java Virtual Machine 1.4.2 or higher.
This tools helps you in splitting PDF documents into individual pages, merge many pages into a single document, extract odd/even pages and many other features in its basic version.
To learn more about this tool or to download a copy of it visit pdfsam.org
Dec
06
2009
06
2009
HTTP-Header: User-agent modification
When a browser makes a request to the server, it sends information such as its operating system name, version in addition to the type of the browser from which the request originates in the header variable “user-agent”.
Depending on the request made, server responds back with specific details which can range from browser specific css layout to calling certain javascriptsfor certain browsers.
Changing the user-agent also helps us in understanding how spider-agents or bots will see the pages that we build. It also helps us design applications that will mimic a request as originating from a mobile phone and helps us in viewing the behavior of the application in different mobile clients.
To read more about HTTP-Headers check ietf
Dec
04
2009
04
2009
LogMeIn, Hamachi: Create VPN in minutes
Managed or Unmanaged networks? Create a VPN in minutes with this software which is available FREE of cost for non-commercial use.
Setting up a Virtual Private Networks is as easy as clicking through the buttons. Check out this product at LogMeIn
Nov
27
2009
27
2009
WebScarab for web application test
WebScarab is a testing tool used for analysing application data that is passed between browsers and servers. It can be used to review and modify data at either end by intercepting data originating from http and https layers. This tool can also be used as a bandwidth simulator (slow/fast network), in session id analysis, spidering url’s, parameter analysis and for many other testing schemes.
WebScarab is developed as an open source tool by The Open Web Application Security Project (OWASP) and can be downloaded from OWASP website
Nov
19
2009
19
2009
GUID: Meaning and its application
GUID stands for “Global Unique Identifier” and is a term usually referring to Microsoft’s implementation of unique identity number (in a distributed environment) that it generates to identify different entities such documents, COM’s, DLL’s, interfaces, records, and other objects. It is also known as UUID – Universal Unique Identifier interchangeably.
GUID implemenation is a 128 bit (16 byte) value consisting of sets of hexadecimal digits separated by hyphens. As the total number of unique keys is large the probability of two numbers being the same is very small.
The AutoNumber datatype in MS-Access and the Identity datatype in SQL Server is a GUID implementation.
(more…)
Nov
17
2009
17
2009
Firefox: Developer Friendly Browsing Tool
Firefox is one of the best tool available for web developers which equips the developer with code testing and debugging capabilities.
There are many useful firefox options and extensions that comes in handy during software development life cycle and in this article we will be listing few of useful plugins that we commonly use.
To find information related to the page that is getting displayed on the browser click Tools > Page info. This will give you permission settings of a page, security identity of the page, feed url and other page specific information like page content-type, encoding, meta tags used, cookie permission settings etc.
Web Developer extension
Added as a toolbar in firefox, this extension gives CSS related information, page information, outlines page elements, tab index, gives topographic information and many such details.
(more…)
Nov
16
2009
16
2009
SSL: Points to consider before choosing the right certificate
Points to consider before choosing the SSL certificate
i) Strength of the encryption offered by the certificates
ii) Browser comptability or recognition of the certificates. A well known brand is recognized by most of the browsers in the market
iii) If the certificate offers backward comptability across browsers offering
iv) Whether the Certification Authority (CA) is a Trusted Root or if they use a Chained Root Certificates.
v) Which web server will be used for SSL installation. Chained root certificates may be little complicated on some web servers.
vi) Nature of the application that will be served over the SSL – depending on the volume of the transactions and the value of each transaction
vii) Warranty offered by the certificate (if that matters which most certainly is when it comes to ECommerce products)
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