Curl is a C library available on many operating systems. Many of the C implementations of scripting languages such as PHP make a Curl library available. Tropo uses the Java implementation of each scripting language, therefore any libraries only available in C are not supported by the respective Java implementation of that language on Tropo. Some languages, like PHP, have implemented curl in Java. For these languages, all of the curl features are available.
We recommend that when a certain library is not available, that the Java API be used from the scripting language.