Category: headers

I needed to add an additional response header to my requests to aid in tracking errors.

Here is my solution. A middleware that will add the AppInsights Operation ID to the response. The Operation ID is unique to each request so searching for it is simple.

import { Request, Response, NextFunction } from 'express';
import appInsights from '../../lib/appInsights';

export default (req: Request, res: Response, next: NextFunction) => {          
    const { operation } = appInsights.getCorrelationContext();    
    
    res.setHeader('X-Operation-ID', operation.id);
    
    next();
};