The error block in AJAX is not triggered when the API server responds with an HTTP 500 status code

I need to incorporate a retry mechanism in my JavaScript code for calling an API:

$.ajax({
            url: api_url + 'report',
            type: 'GET',
            dataType: 'json',
            async: false,
            tryCount : 0,
            retryLimit : 3,

            headers: {
                "Authorization": "Basic " + btoa(api_username + ":" + api_pass)
            },

            data: {start: start_date, end: end_date},
            success: function(result) {
                data = result.results;
                console.log("success");
            },
            error : function(xhr, textStatus, errorThrown ) {
                console.log("in error");
                if (textStatus == 'timeout') {
                    this.tryCount++;
                    if (this.tryCount <= this.retryLimit) {
                        //try again
                        console.log("try count:");
                        console.log(this.tryCount);
                        $.ajax(this);
                        return;
                    }            
                    return;
                }
                if (xhr.status == 500) {
                    console.log("still 500");
                } else {
                    console.log("still !500");
                }
            }
        });

In the event of server issues resulting in an HTTP 500 response, the given JavaScript file may not trigger the "error:" block and the line "console.log("in error");" doesn't appear in the console.

How can I effectively implement a retry logic to automatically reattempt requests multiple times when encountering a 500 status from the server?

Answer №1

When a 500 error occurs, it usually indicates an issue with the backend server rather than the client-side JavaScript. Unfortunately, there may not be much you can do as a frontend developer to resolve this issue. However, you could suggest to the backend developers to improve their error handling procedures and ensure they return relevant error responses when possible.

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