Errors when trying NetSuite's Restlet interface: datain is null -

i'm trying out restlets first time , having trouble returning data.

i've built basic restlet , deployed in netsuite. code follows:

function getrestlet(datain) {         return nlapiloadrecord(datain.recordtype, datain.id); // e.g recordtype="customer", id="769" } 

using chromes' rest console application i've set following:

request uri: https://rest.netsuite.com/app/site/hosting/restlet.nl?script=123&deploy=1&recordtype=customer&id=2409 request headers: nlauth nlauth_account=123456,nlauth_email=email@emailaddy.com,nlauth_signature=password 

running get operation return following error:

error code: js_exception error message:type 

followed following email:

date & time: 8/19/2013 2:48 pm execution time: 0.06s script usage: 0 script: getrecord type: restlet function: getrestlet error: sss_missing_reqd_argument type stack trace: getrestlet(getcustomer.js:14) restletwrapper(null$lib:3) 

the customer record exists, restlet code netsuite system, , error email when script fails know deployment url good.

any ideas on i'm doing wrong?

--edit--

changing function signature function getrestlet(type,datain) resolves type error, although get:

error code: unexpected_error error message:typeerror: cannot read property "recordtype" undefined (getcustomer.js#14) 

i've removed customer , id request uri , instead listed them in request payload section of rest console.

--edit 2--

adding nlapilogexecution('debug', 'json.stringify(datain) is:', json.stringify(datain)); function returning blank log entry. appears datain null....

i had similar issue resolved once set request header content-type application/json.

the default content-type text/plain passes stringified json object function , expects string returned.

if set content-type application/json or application/xml 'datain' parameter come in javascript object.

from netsuite docs:

if users specify content type other json or text, 415 error returned following message:

invalid content type. can use application/json, application/xml or text/plain restlets.

if users provide data in format different specified type, following error returned 1 of following messages:

error code = invalid_return_data_format error message = invalid data format. should return text. error message = invalid data format. should return javascript object.