# 11206: HTTP protocol violation

Log Type: APPLICATION

Log Level: ERROR

## Description

There was an error speaking HTTP to the target URL.

### Possible causes

* Server misconfiguration
* Network disruption
* Making HTTP connections to an HTTPS port
* There is an invalid symbol in the TwiML Cookie

### Possible solutions

* Verify your web server is serving valid HTTP for the URL
* Verify the network connection to your server is stable
* Verify the URL is not directing you to an SSL port
* Remove the following characters from the TwiML Cookies: '\t', '\r', '\n', '\v', '\f'
* TwiML cookies cannot have an empty name