# \[Breakpoint] Modify Request/Response by Raw Message

> Fix "Invalid Request HTTP Message" or "Invalid Response HTTP Message" when you edit a raw request or response in the Proxyman Breakpoint Raw tab.

When you edit a request or response in the **Raw** tab of a [Breakpoint](https://proxyman.com/docs/advanced-features/breakpoint), Proxyman checks the HTTP message as you type. If the syntax is wrong, it shows an error at the bottom of the editor, such as **Invalid Header**, **Invalid Request HTTP Message** or **Invalid Response HTTP Message**. Your change is not applied until the message is valid again.

![Proxyman Breakpoint Raw tab showing an Invalid Header error for the line X-Debug true, which has no colon](https://proxyman.com/docs/assets/proxyman-breakpoint-raw-invalid-header.jpg)

_A header line without a colon is invalid_

## How to fix it

* The first line of a request is the method, the path and the HTTP version, for example `GET /get?id=123 HTTP/1.1`.
* The first line of a response is the HTTP version and the status, for example `HTTP/1.1 200 OK`.
* Put each header on its own line, as `Name: Value`.
* Leave one empty line between the headers and the body.
* To turn off a header without deleting it, start its line with `//`.
* To start over, use **Reset to the Original** to restore the original message.

## Video

[Video: Modify requests and responses with Breakpoint](https://proxyman.com/videos/breakpoint-tool) (30 seconds)