Learn to dig in...
29 January 2014
Do not be affraid of the comand line and tools associated with the console. Web-browsers and other web-based tools often tries to fix errors en “raw content” and may though this effort actually hide errors. A simple example of this, is broken HTML - if tags are missing, misplaced or exists in excess - the browser silently fixes this errors in a kind effort to let you see the content. Slightly more complicated examples could include encoding errors or invisible characters (white spaces, new lines, tabs) which could cause errors.
To spot these issues, learn to use the shell - the command line - and utilize the tools available here. Tools like wget and cUrl let you get the “raw content”, just as the mysql shell offers a more “unfiltered” view to the actual data in the database.