Fixed Non-ASCII attachment filename will crash when downloading.

Thanks to xet7 !

Fixes #2759

packages/wekan-request/tests/test-onelineproxy.js

@@ -0,0 +1,46 @@
+var http = require('http')
+  , assert = require('assert')
+  , request = require('../index')
+  ;
+
+var server = http.createServer(function (req, resp) {
+  resp.statusCode = 200
+  if (req.url === '/get') {
+    assert.equal(req.method, 'GET')
+    resp.write('content')
+    resp.end()
+    return
+  }
+  if (req.url === '/put') {
+    var x = ''
+    assert.equal(req.method, 'PUT')
+    req.on('data', function (chunk) {
+      x += chunk
+    })
+    req.on('end', function () {
+      assert.equal(x, 'content')
+      resp.write('success')
+      resp.end()
+    })
+    return
+  }
+  if (req.url === '/proxy') {
+    assert.equal(req.method, 'PUT')
+    return req.pipe(request('http://localhost:8080/put')).pipe(resp)
+  }
+
+  if (req.url === '/test') {
+    return request('http://localhost:8080/get').pipe(request.put('http://localhost:8080/proxy')).pipe(resp)
+  }
+  throw new Error('Unknown url', req.url)
+}).listen(8080, function () {
+  request('http://localhost:8080/test', function (e, resp, body) {
+    if (e) throw e
+    if (resp.statusCode !== 200) throw new Error('statusCode not 200 ' + resp.statusCode)
+    assert.equal(body, 'success')
+    server.close()
+  })
+})
+
+
+