Improper header validation in httpsoft/http-message
### Impact
Improper header parsing. An attacker could sneak in a newline (`\n`) into both the header names and values. While the specification states that `\r\n\r\n` is used to terminate the header list, many servers in the wild will also accept `\n\n`.
### Patches
The issue is patched in 1.0.12.
### Workarounds
There are no known workarounds.
### References
* https://www.rfc-editor.org/rfc/rfc7230#section-3.2.4