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:

• my local url is : localhost:8080/someexample
• my ngrok url is : http://f07d0862.ngrok.io/

it show this error:

Bad Request - Invalid Hostname  HTTP Error 400. 

Godgiven

Can you tell how are you generating the ngrok url? – Aaronson

Hey Sunny: can you mark the answer as correct ? – Poignant

Duplicate of #30535836 – Preferable

Answer 1

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

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

Firkin

This works perfectly, and is also a perfect solution for developing with Facebook Messenger webhooks. – Alben

This answer is missing the quotation marks around the host-header value, and the colon, should be: -host-header="localhost:8080" – Aquatint

Please refer the following link #30535836 – Preferable

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 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 – Cloudy

I needed to use two leading dashes on ngrok 3.0.6: --host-header="localhost:8080" – Wavellite

Answer 2

This is the solution you want.

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

Selfpossessed

Answer 3

This worked for me:

ngrok http -host-header=localhost 8080

Jotting

Answer 4

For me it was this

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

Cobnut

Answer 5

This command works for me(note the double hyphen before host keyword):

ngrok http --host-header=localhost 48333

Letti

Answer 6

If getting -o flag something error try with double -

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

Adrienadriena

Answer 7

May be you should turn off your firewall.

That works for me.

Rollick

Ngrok bypasses firewall restrictions, how should a firewall be a problem. – Joggle