Equivalent of curl's "resolve" option in HTML/Javascript page

Question

I have an ingress controller that, in order to access certain resources behind it, I need to specify the resource via curl 's --resolve feature. For example, this request will fail (ie not access the endpoint I need):

curl http://foo/endpoint

However, this request will succeed:

curl --resolve foo:80:192.168.100.123  http://foo:80/endpoint

In short, I require the equivalent of the --resolve feature, but in a simple HTML page instead. The end goal is to just be able to achieve this --resolve functionality via a web browser. I've tried various graphical tools such as "RESTer" and other REST client plugins for Firefox, but none of them seem to support this functionality. So, I guess my only remaining option is to write a web page (ie HTML) that can accomplish the same thing.

Question: how do I craft/issue such a request so I can execute it in a browser, rather than via curl ? Is this just some HTTP header hackery that I need to implement? I know that trying to do something like setting the Host field in the HTTP header doesn't work, so I assume it's more complicated than that.

Edit: it seems the curl -specific name for the feature is CURLOPT_RESOLVE .

Answer 1

There is no equivalent feature in fetch or XHR .

Hostname resolution cannot be overridden. You can't even make a request directly to an IP address and override the Host request header because it is marked as a forbidden header .

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The closest you could come would be to write a proxy (using server-side code) and then make the request from the browser to the proxy.