A metric imperiac converter

• I will help prevent the client from trying to guess(sniff) the MIME type.
• I will prevent cross-site scripting (XSS) attacks.
• I can GET /api/convert with a single parameter containing an accepted number and unit and have it converted.
• I can convert 'gal' to 'L' and vice versa.
• I can convert 'lbs' to 'kg' and vice versa.
• I can convert 'mi' to 'km' and vice versa.
• If my unit of measurement is invalid, returned will be 'invalid unit'.
• If my number is invalid, returned with will 'invalid number'.
• If both are invalid, return will be 'invalid number and unit'.
• I can use fractions, decimals or both in my parameter(ie. 5, 1/2, 2.5/6), but if nothing is provided it will default to 1.
• My return will consist of the initNum, initUnit, returnNum, returnUnit, and string spelling out units in format {initNum} {initial_Units} converts to {returnNum} {return_Units} with the result rounded to 5 decimals.
• All 16 unit tests are complete and passing.
• All 5 functional tests are complete and passing.

• /api/convert?input=4gal
• /api/convert?input=1/2km
• /api/convert?input=5.4/3lbs
• /api/convert?input=kg

{initNum: 3.1, initUnit: 'mi', returnNum: 5.0000008, returnUnit: 'km', string: '3.1 miles converts to 5.00002 kilometers'}