The behavior exhibited by node.js express is quite peculiar

I am currently running an Express server.

My process involves uploading an Excel File from HTML, which is then parsed by Express to perform calculations.

Each row in the Excel file contains information about a User's address.

For each address, our Express server utilizes Google Map geocoding API to determine the latitude and longitude.

Due to Google's limit of 50 requests per second to their geocoding API, I have to use setTimeout to stagger the calculations.

For instance, if the Excel file contains 50 addresses, I need to apply setTimeout to each address to prevent exceeding the rate limit.

Below is the code snippet demonstrating how to implement setTimeout for calculating latitude and longitude:

Answer №1

When your code includes the Access-Token request header, it prompts browsers to initiate a CORS preflight OPTIONS request before proceeding with the actual POST request.

For more information, you can visit https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS#Preflighted_requests. Essentially, if your code is adding the Access-Token header to the request, browsers will automatically send the additional preflight OPTIONS request as part of the CORS protocol.

Postman does not trigger this extra request because it does not perform the CORS preflight OPTIONS request—this is only done by browsers for requests initiated by XHR/Fetch from frontend JavaScript code in a specific origin (which Postman is not).

Answer №2

After much trial and error, I have found a solution to the problem by including 'Access-Token' in the request body instead of the request header. This change has resolved issues with only one request being received by my server. Special thanks to @sideshowbarker for inspiring me to try this approach.

Although I still believe this issue may be a bug in Express, since it did not manifest in my local development environment, I have decided not to submit a formal report to them.

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