Gmail API: asynchronous label update/application - gmail

Question

I'm using the Users.messages:modify method to apply labels to emails, however, I must refresh the page before the labels which I apply programmatically appear on the gmail user interface.
The desired action is akin to if I manually select a gmail message and then apply a label from the dropdown label applicator at the top of the gmail screen: the label is applied asynchronously. Is this possible to do programmatically?
Code
var applyLabel = function (gapiRequestURL, labelIdsArr)
{
$.ajax({
url: gapiRequestURL,
method: "POST",
contentType: "application/json",
data: JSON.stringify({
addLabelIds: labelIdsArr
}),
success: function(msg){
// alert(JSON.stringify(msg));
},
error: function(msg){
alert("Error:" + JSON.stringify(msg));
}
})
}
var decideWhichLabelToApply = function(messageContentsArr){
var testLabelOne = "Label_12"
var testLabelTwo = "Label_13"
var labelIdsArr = []
for(var i=0; i < messageContentsArr.length; i++){
var currentMessage = messageContentsArr[i]
var messageID = currentMessage.id
if (true){
var labelModifyURL = "https://www.googleapis.com/gmail/v1/users/me/messages/" + messageID + "/modify?access_token=" + thisToken
labelIdsArr.push(testLabelOne)
applyLabel(labelModifyURL, labelIdsArr)
}
else {
var labelModifyURL = "https://www.googleapis.com/gmail/v1/users/me/messages/" + messageID + "/modify?access_token=" + thisToken
labelIdsArr.push(testLabelTwo)
applyLabel(labelModifyURL, labelIdsArr)
}
}
}

Answer 1

Not that I know of. The Gmail web interface does some lazy caching and doesn't seem to notice particularly well changes to the underlying data (i.e. from Inbox, IMAP, API, etc). I believe it doesn't require a full browser (F5) refresh but certainly one needs to do some UI action like clicking on labels or hitting the in-webpage refresh icon for update to show up.