24 lines
613 B
JavaScript
24 lines
613 B
JavaScript
const { Transform } = require('stream');
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class HeaderHostTransformer extends Transform {
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constructor(opts = {}) {
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super(opts);
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this.host = opts.host || 'localhost';
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this.replaced = false;
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}
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_transform(data, encoding, callback) {
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callback(
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null,
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this.replaced // after replacing the first instance of the Host header we just become a regular passthrough
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? data
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: data.toString().replace(/(\r\n[Hh]ost: )\S+/, (match, $1) => {
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this.replaced = true;
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return $1 + this.host;
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})
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);
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}
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}
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module.exports = HeaderHostTransformer;
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