Issue with REST POST call: CopyTo in a SharePoint hosted App not working

Question

Hi Community
I have been really struggling to get a cross domain copy to work both in an App or even using REST Tools such as Postman or Google Advanced REST Client. 
Ok there are various blog posts by Scott G et al.  that shows how you can post say in a single domain.  Now that's fairly straight forward
in my case I took a .apsx page and added the following lines of code - Checkin - refresh and great the file gets copied via  the document ready function
(document).ready(function () {
alert('ready!');
var src = "/appsdev/Shared Documents/SrcDoc.docx";
var dst = "/appsdev/Shared Documents/DestDocCopiedByRestTestASPXPage.docx";
jQuery.ajax({
type: "POST",
contentType: "application/json;odata=verbose",
headers: {
"accept": "application/json;odata=verbose",
"X-RequestDigest": jQuery("#__REQUESTDIGEST").val()
url: _spPageContextInfo.webAbsoluteUrl + "/_api/web/getfilebyserverrelativeurl('" + src + "')/copyto(strnewurl='" + dst + "',boverwrite=true)",
success: function (data, errorCode, errorMessage) {
alert('Success: copied the damn file');
var jsonObject = JSON.parse(data.body);
var jsonObjectText = JSON.stringify(jsonObject);
error: errorHandler
Now I make the call in my SharePoint hosted App and I simple can' t  get this to work. Fiddler doesn't exactly help a lot
  var src = "/appsdev/Shared Documents/SrcDoc.docx";
  var dst = "/appsdev/Shared Documents/DestDocCopiedByMyApp.docx";
    var urlWriteLocalFileDebug = appweburl +
   "/_api/SP.AppContextSite(@target)/web/Getfilebyserverrelativeurl('" + src + "')/copyTo(strNewUrl='" + dst + "', bOverWrite=true)?@target='" + hostweburl + "'";
executor.executeAsync(
method: "POST",
contentType: "application/json;odata=verbose",
headers: {
"accept": "application/json;odata=verbose",
"X-RequestDigest": jQuery("#__REQUESTDIGEST").val()
url: urlWriteLocalFileDebug,
success: function (data, errorCode, errorMessage) {
alert('Success: copied the damn file');
var jsonObject = JSON.parse(data.body);
var jsonObjectText = JSON.stringify(jsonObject);
error: errorHandler
I can happily run a GET and see the properties of my file but POST no way.   Curriously, when I try to run the same command for say Google Advanced Rest Client I get nowhere
Is this a new mensa test!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
Freelance consultant

Answer 1

Hi
I have now tested against a trail Office  365 Developer site and I had to make a few adjustments
- change the url
- change the target to SharePoint Onlne
- change the url 
I still wasn't happy so I created a new SharePoint Hosted app and pointed at the above developer site.  I copied my CrossDomainExec.js and stripped all my code except my CopyItemInSameLIbrary method which hasn't changed since I created this post. 
- changed the App Manifest permissions to Web -full Control ( was previously tenant)
I still got errors which is really painful as you don't even see the POST request in Fiddler
The URL used for my POST is as follows ( note host URL is fictitious)
"https://myapphell-547d8061d39e38.sharepoint.com/sites/appsdev/RESTTestSHA/_api/SP.AppContextSite(@target)/web/Getfilebyserverrelativeurl('/sites/appsdev/Shared Documents/SrcDoc.docx')/copyTo(strNewUrl='/sites/appsdev/Shared Documents/DestDoc.docx', bOverWrite=true)?@target='https://myapphell.sharepoint.com/sites/appsdev'" String
Ran the app a second time and now I see......Wow it WORKS!!!!!! ..Can't be true can it?
.... next I will switch the target url to my on prem farm to see if this still works so watch this space!
Daniel
Freelance consultant