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On Linux I'm starting chrome as google-chrome --proxy-server=127.0.0.1:8888 --proxy-bypass-list="" however it's still not using the proxy for localhost requests.

How can I force chrome to use my proxy for localhost?

You may wonder why I wanna do this, I'm trying to record all the requests, using jmeter, to an application running on local environment.

Filipe Giusti
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    Have you checked this question and its answer and comments: https://superuser.com/questions/646304/google-chrome-cant-access-localhost-domains – music2myear Mar 28 '19 at 23:40
  • And this one: https://stackoverflow.com/questions/30467573/chrome-localhost-does-not-work – music2myear Mar 28 '19 at 23:42
  • @music2myear thanks for pointing it out, however those are not related to my problem. I can access localhost, I'm trying to access it through a proxy, which seems chrome bypasses it by default without any way to not bypass. – Filipe Giusti Mar 31 '19 at 20:49
  • In your question you are not accessing local host THROUGH a proxy, you are accessing a proxy ON localhost. There is a significant difference, and both those questions deal with proxies on localhost, which is what your question described. Either re-write your question to clarify what you are asking, or re-read the linked questions again. – music2myear Apr 01 '19 at 15:24
  • _you are not accessing local host THROUGH a proxy_ exactly, so how can I make this happen? _you are accessing a proxy ON localhost_ yes, that's correct. Rephrasing, I wanna access a server in localhost through a proxy in localhost. I had re-read the linked questions, they still aren't related to my problem. Please enlighten me, how can I make my question more clear? – Filipe Giusti Apr 02 '19 at 17:05
  • I have the same problem, none of the above links helped. The local machine is Windows, the remote is Ubuntu. The proxy connection is tunneled through SSH. I can access the remote `127.0.0.1` using `curl --proxy` on the local Windows machine, but on the same machine neither Firefox nor Chrome can access the remote `127.0.0.1` through the proxy. The interesting thing is that this worked some moths ago, then stopped working. First I though it's an issue with the remote server, but since the local `curl --proxy` works I'm sure it's a browser or OS problem. – Crouching Kitten Jun 15 '19 at 23:23

3 Answers3

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Finally I've found a tricky solution for this. It was clear from the beginning that this is a browser issue, since I was able to make requests with curl --proxy.

The trick is that the DNS resolution also happens through the proxy, therefore on the remote machine. So just add a new entry to your remote /etc/hosts file:

127.0.0.1       local

Then you can access the remote "localhost" on your local machine, since Chrome knows nothing about this new host name. For example by: http://local:8080/mysite.

Crouching Kitten
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For Windows10, this is a System issue, that localhost will always goto current PC, and won't go through proxy.

U can set this in the OS's proxy setting to force localhost go proxy.

  • Open the OS's proxy setting
  • Ensure your proxy server(host & port) are set.
  • Below, there will be a input for you, says Use the proxy server except for address that start with the following entries. Use semicolons(;) to separate entries
  • Add <-loopback> into that input.
  • Save.

Then your request of localhost to go under proxy.

Note:

  • Though broswers will bypass localhost by default, the CMD will work even without this setting. curl -x http://{proxyserIp}:{proxyPort} http://localhost:3000
  • If u r using some browser extension(like SwitchyOmega), u can also add <-loopback into it's Bypass list, this still works.

refer: https://docs.microsoft.com/en-us/archive/blogs/fiddler/fiddler-and-the-ie9-release-candidate https://stackoverflow.com/questions/37700079/how-to-intercept-local-server-web-requests-using-burp-in-internet-explorer

Chen Tian
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If you are using mitmproxy or charles to debug localhost requests, try using Chrome 69 in macos with system proxy set.

tianjianchn
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