Bad Request - Invalid Hostname HTTP Error 400. The request hostname is invalid. when i am using ngrok

Question

When I am using ngrok & run url given by ngrok with following configuration:

it show this error:

Bad Request - Invalid Hostname  HTTP Error 400.

Duplicate of https://stackoverflow.com/questions/30535336/exposing-localhost-to-the-internet-via-tunneling-using-ngrok-http-error-400 — Pratyush Dhanuka, Nov 22 '17 at 07:26

score 181 · Answer 1 · edited Nov 04 '20 at 14:48

181

Your web server is rejecting the request since it has different hostname.

Try ngrok http -host-header="localhost:8080"

edited Nov 04 '20 at 14:48

Gregory

answered Dec 09 '15 at 15:37

Bharat

This works perfectly, and is also a perfect solution for developing with Facebook Messenger webhooks. – Mike Upjohn Jun 13 '17 at 12:24
8

This answer is missing the quotation marks around the host-header value, and the colon, should be: `-host-header="localhost:8080"` – moritzg Jun 26 '17 at 08:47
Please refer the following link https://stackoverflow.com/questions/30535336/exposing-localhost-to-the-internet-via-tunneling-using-ngrok-http-error-400 – Pratyush Dhanuka Nov 22 '17 at 07:25
This is the command that worked for me is ngrok http -host-header=localhost 8080 Using the other command showed an error FAILED TO COMPLETE TUNNEL CONNECTION The connection to http://27900a3a1d5e.ngrok.io was successfully tunneled to your ngrok client, but the client failed to establish a connection to the local address host-header=localhost:33511. Make sure that a web service is running on host-header=localhost:33511 and that it is a valid address. The error encountered was: dial tcp: lookup host-header=localhost: no such host – Momodu Deen Swarray Apr 22 '21 at 13:57
I needed to use two leading dashes on ngrok 3.0.6: `--host-header="localhost:8080"` – Holistic Developer Aug 02 '22 at 12:53

vijay · Answer 2 · 2019-12-19T09:51:57.867

40

This is the solution you want.

ngrok http 8080 -host-header="localhost:8080"

edited Dec 19 '19 at 09:51

answered Aug 08 '19 at 10:18

vijay

score 6 · Answer 3 · answered Jan 19 '21 at 16:22

6

This worked for me:

ngrok http -host-header=localhost 8080

answered Jan 19 '21 at 16:22

Lug

score 3 · Answer 4 · answered Jun 02 '22 at 06:21

3

For me it was this

ngrok.exe http https://localhost:44315 --host-header=localhost:44315

answered Jun 02 '22 at 06:21

Augis

score 0 · Answer 5 · answered Oct 26 '22 at 20:27

0

If getting -o flag something error try with double -

ngrok http 8080 --host-header="localhost:8080"

answered Oct 26 '22 at 20:27

Captain_Levi

score -2 · Answer 6 · answered Mar 26 '18 at 05:15

-2

May be you should turn off your firewall.

That works for me.

answered Mar 26 '18 at 05:15

Joy Zhu

Ngrok bypasses firewall restrictions, how should a firewall be a problem. – Sevada 797 Jun 06 '22 at 14:11

6 Answers6