Help with using Yahoo Geocode API

Greetings everyone,

I need to do some simple geocoding, just to convert an address to lat/lon coordinates. I have tried Yahoo Geocode API, but with no success. Furthermore, Yahoo Geocode API have been deprecated, so I decided to go with Yahoo PlaceFinder. I managed in Matlab to build proper URL address for using this web service. For example: Avenue B, NYC

http://where.yahooapis.com/geocode?q=avenue+b,nyc?appid=1OpSgf4s

The point is, the URL gives the result when its typed in a web browser, but if its called from Matlab, the result is:

[#document: null]

Do you have any constructive ideas? Am I doing something wrong, or what could be the problem? Additionally, how to read the results in Matlab?

Thank you in advance.

Sincerely, Nikola Besinovic