I have a web app on GAE written in Go that performs some calculations for the user. The website communicates with the server through a simple HTTP Post. I want to let the user be able to share a link to the result they obtained without changing much in my Go code.
Is there some way to encode a HTTP Post message as a website url that would execute on the app engine as if the user sent the Post from the website?
How would the code for a button that would copy the proper link to user's clipboard (noting that the field values can change between page being loaded and user wanting the link, so hard-coding the values through GAE parser wouldn't work).
Use a GET instead of a POST. That's the point of GET : it generates a bookmarkable URL.
GET should always be used for idempotent operations, unless the sent data contain secret information or are too large to be put into GET parameters.
As in JB's answer you can use GET instead of post. Or you can store the POST data in your datastore with an ID for each record. Then you can generated a url with that ID as a GET parameter. When user clicks on that link your app reads your POST data from datastore, complete the request.
Check this link for copying link/text to users clipboard.
http://www.deluxeblogtips.com/2010/06/javascript-copy-to-clipboard.html