Can I use REST to copy files from on library in a HNSC to another library in a different HNSC (or even different Tenants)

Question

Hi
I am building a SharePoint hosted app which uses a REST Call to get file details of a file held in a host web library. Ok if want to copy that file to another a library held in another HNSC. Surely this is possible subject to the app manifest permission
set to   tenant .  
https://msdn.microsoft.com/office/office365/api/files-rest-operations#Folder6
Daniel, WSL

Answer 1

Reken
Yes it is difficult. I coded up 3 requests in a SharePoint hosted app
1) get file properties
 2) readfile  ( binarycontent)
 3) write file (binarycontent) to library in another HNSC
1- 2 works fine but I am struggling with the 3) 
To stop me from despairing ;-(  I thought I would modify my app to simply do a local copy ...
However, this  not as simple as it looks.....
(BTW this may be better discussed in a new post....)
listurldir = "/appsdev/Marketing Lib;
itemurl = "/Marketing Lib/betterlivingwithoutprogramming.pdf";
filename = "betterlivingwithoutprogramming.pdf";
// Get file to Copy This works with a GET and no Header
var urlGetLocalFile = appweburl +
"/_api/SP.AppContextSite(@target)/web/folders/GetByUrl('" + listurldir + "')/Files/getbyurl('" + filename + "')?@target='" + hostweburl + "'";
executor.executeAsync(
url: urlGetLocalFile,
method: "GET",
success: Function.createDelegate(this, function (data, errorCode, errorMessage) {
// binary data available in data.body
deferred.resolve(data, errorCode, errorMessage);
error: Function.createDelegate(this, function (data, errorCode, errorMessage) {
deferred.reject(data, errorCode, errorMessage);
This works and finds my file ...... ok so far so good lets do a local copy with
CopyTo
localtargetfilepath = "/appsdev/Shared Documents/BeterLivingwithoutanyProgrammingever.pdf"var urlWriteLocalFile = appweburl +
    "/_api/SP.AppContextSite(@target)/web/folders/GetByUrl('" + listurldir + "')/Files/getbyurl('" + filename + "')/copyTo(strNewUrl='" + localtargetfilepath + "', bOverWrite=true)?@target='" + hostweburl + "'";
 executor.executeAsync(
            url: urlWriteLocalFile,
            method: "POST",
            success: Function.createDelegate(this, function (data, errorCode, errorMessage) {
                // binary data available in data.body
                deferred.resolve(data, errorCode, errorMessage);
            error: Function.createDelegate(this, function (data, errorCode, errorMessage) {
                deferred.reject(data, errorCode, errorMessage);
Unfortunately, I can't get passed this error  
I have changed the HtpRuntime paramenters as in maxrequestlength and maxurlLength/. 
Tried various header combinations with one or more of the following headers
method: "POST",
headers: {
"Accept": "application/json; odata=verbose",
"X-RequestDigest": $("#__REQUESTDIGEST").val()
binaryStringResponseBody: true,
However, I simply can't get passed the error
Any ideas anyone?
Daniel, WSL
Freelance consultant