[Programming] Throw out a 'The Connection was reset' error after submiting (POST) form

Here are a number of reasons that may occurs error after submiting (POST) form:

1. Too much parameter sent:
   Try to reduce the useless input before submit
2. Reach the max input var:
   set "max_input_vars   1000" in php.ini or in PHP page
3. Loading time too long:
   In particular, the values for max_execution_time and max_input_time could safely be increased. Both of these are currently set to 180 seconds, or 3 minutes
4. Reach the max of files:
   Set "max_file_uploads   20" in php.ini or in PHP page
5. Posting data too large:
   Set "post_max_size   28M" in php.ini or in PHP page
6. Over memory:
   Set "memory_limit   128M" in php.ini or in PHP page