I don't know why but the following URL:

http://www.eatyourveggies.com.au/sendgrid/sendgrid.php
?api_user=<user>
&api_key=<key>
&html=
&text=test
&subject=test
&from=<email address>
&fromname=Dim
&to=<email address>
&toname=Adam

works fine when I use:

 

- paste it into the web browser

- use insert from URL script step

 

but not when I use

 

GetURLasText()

 

Error I get is:

 

java.io.IOException: Server returned HTTP response code: 403 for URL.... etc

I was able to replicate your error here from our example file but was also able to use different URLs to get a successful return. 403 errors are kind of ambiguous so there could be any number of reasons why you got that forbidden error. That module is just trying to hit the URL using the URL class in java so since there is no browser to take care of any kind of overhead needed to access this site (hence why you can paste it into an address bar with no problems) you are given the 403 response from the server. This is just one of the many possibilities. I found an issue on stack overflow that may help http://stackoverflow.com/questions/13670692/403-forbidden-with-java-but-not-web-browser. From that post it looks like you can tweak the code in the GetURLasText module to work for you.