3 examples of 'express headers' in JavaScript

6
function secureHeaders (app, frontendApp) {
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  // Content Security Policy
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  app.use(helmet.contentSecurityPolicy({
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    directives: {
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      defaultSrc: ["'none'"],
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      // Allow 

38
public getHeader(field: string): string | undefined {
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  return this.req.header(field);
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}

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addCustomHeaders(customHeaders?: ICustomHeader[]) {
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    if (customHeaders) {
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        this.addUse(null, (req, res, next) => {
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            customHeaders.forEach((customHeader) => {
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                let value: string | undefined = customHeader.value.toString();
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                if (customHeader.isEnv && value && process.env[value]) {
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                    value = process.env[value];
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                }
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                res.header(customHeader.key, value);
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            });
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            next();
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        });
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    }
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}