Error from UrlFetchApp when passing Short URL - google-apps-script

Question

Facing below Exception while calling get request using UrlFetchApp.fetch.
Exception: Request failed for https://shorturl.com (myshorturl)
returned code 302
I do not get the error when longurl length is 5606 length.
I get the error when longurl length is more than 5609 length.
var url = shortenUrl(longurl);
Logger.log("URL:" + url);
var response = UrlFetchApp.fetch(url, {
"method": "get",followRedirects: true
});
Logger.log("Response" + response.getContentText())
function shortenUrl(longURL) {
var url = "https://firebasedynamiclinks.googleapis.com/v1/shortLinks?key=mykey";
var payload = {
"dynamicLinkInfo": {
"dynamicLinkDomain": "mypage.page.link",
"link": longURL,
"iosInfo": {
"iosBundleId": "mybundleId"
}
}
};
var parameters = {
method: 'post',
payload: JSON.stringify(payload),
contentType: 'application/json',
muteHttpExceptions: true
};
var response = UrlFetchApp.fetch(url, parameters);
var myArr = JSON.parse(response);
var shortLink = myArr['shortLink'];
return shortLink;
}

Answer 1

The shortUrl will redirect to another url. 302 Found status code informs the client that there is a redirection and provides the redirect url. Try setting the following parameter in addition:
followRedirects: true,
muteHttpExceptions: true
EDIT:
Based on the new information, that the longUrl length exceeds 5000 characters, Note that UrlFetch calls have hard limitations on the url length, which is currently 2kB/call. If we assume 1byte per url character, the maximum advertised acceptable url length is around 2048 characters.
References:
RFC7231
MDN 302
UrlFetchApp Advanced Parameters
Quotas: Current limitations