Requesting encrypted data in IE

Hi All,

I currently make requests to my webserver via ajax and get a response in an encrypted format.

The response text has a null character (0) and Internet Explorer is terminating the response on that character. FireFox and Chrome are able to see the entire response text.

I have tried sending the following headers from php:

PHP Code:

---

header('Content-type: application/octet-stream');
header('Content-type: text/plain;charset=iso-8859-1');
header('Content-Type: application/octet-stream; charset=utf-8');
header('Content-Length: 97'); 


---

And the following header from Javascript:

Code:

---

http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

---

Example of response text:

Code:

---

P        GBFVYXQ@
QVRTWQVV
VV
TPTQVGBA]CPFVG
PWT
VTS
V
W
UVR

---

I want to try and achive this without using urlencoding, as it expands the response unnecessarily.

Does anyone know any additional headers that I could send to make IE happy, or maybe headers in the ajax request?

Thanks all in advance.