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fix: send Host header as the first header - #1888
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Currently node-fetch sends the Host header as the last header when it is automatically added. Browsers and other HTTP libraries send Host as the first header. This change prepends the Host header to match browser behavior. If the user provides a custom Host header, it is still placed first. Fixes node-fetch#1570
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When making requests, node-fetch currently sends the Host header as the last header if the user did not provide one. Browsers and other HTTP libraries (like curl) send Host as the first header.
This PR updates getNodeRequestOptions to:
The fix reconstructs the headers object with Host first, then all other headers in their original order.
I also added two tests to verify the behavior.
Closes #1570