A small note about nginx locations

gistfile1.txt

http://wiki.nginx.org/NginxHttpCoreModule#location

Example:

location  = / {
  # matches the query / only.
  [ configuration A ] 
}
location  / {
  # matches any query, since all queries begin with /, but regular
  # expressions and any longer conventional blocks will be
  # matched first.
  [ configuration B ] 
}
location ^~ /images/ {
  # matches any query beginning with /images/ and halts searching,
  # so regular expressions will not be checked.
  [ configuration C ] 
}
location ~* \.(gif|jpg|jpeg)$ {
  # matches any request ending in gif, jpg, or jpeg. However, all
  # requests to the /images/ directory will be handled by
  # Configuration C.   
  [ configuration D ] 
}
Example requests:

/ -> configuration A
/documents/document.html -> configuration B
/images/1.gif -> configuration C
/documents/1.jpg -> configuration D
Note that you could define these 4 configurations in any order and the results would remain the same.