Duplicate headers received from server

[TemplateTonic]

After loading a test text file as a download attribute, and placing a dummy order when I made it free I then marked it as processing and went back to my success checkout, hit refresh and it was available.

When I clicked download I got an error via Chrome saying:

Duplicate headers received from server
The response from the server contained duplicate headers. This problem is generally the result of a misconfigured website or proxy. Only the website or proxy administrator can fix this issue.
Error 346 (net::ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_LENGTH): Multiple distinct Content-Length headers received. This is disallowed to protect against HTTP response splitting attacks.

What does this mean? How can I fix?

[Songbird]

I just had Zen Cart added to my site and unfortunately before we went live with it, the version 1.5 came out and my web designer upgraded to the new version. I am getting the same error on Chrome. I get a "HTTP 400 Bad Request The Web Page Cannot be Found" Error using IE, and with Firefox I get a "Corrupt Content" Error. The web designer upgraded on his server and was able to download without problems.

Any help on this would be great as I would love to be able to open the new cart sooner than later!

[TemplateTonic]

Chrome screen: http://templatetonic.com/ipage.jpg

[Songbird]

Hi Template Tonic, I wonder if we need to post this again somewhere else as no one seems to want to answer here!

[Kim]

Do not repost. If you have more details it would help the experts to diagnose your problem.

[RescoCCC]

Applicable tutorial:

https://www.zen-cart.com/tutorials/index.php?article=87

[Songbird]

I am new to Zen Cart. My webmaster installed version 1.3.9 on my site. I uploaded all my downloads and set up everything on my end. I did a test sale and everything went through fine until I tested the download link. I then got the following error. I can't get my Zen Cart store up and running until I can get this resolved. I am using Chrome. However, I get error messages with Firefox and IE also. IE was http 400 bad request. Please help!

Oops should have added that he upgraded to 1.5 after I had set up everything.

[Songbird]

Sorry, didn't see this before I posted on the 1.3 to 1.5 upgrade page. Listed the errors there with screen shots for Chrome and Firefox and error message for IE. Will check out the article. Thank you. Any other info you might have would be greatly appreciated! I have reuploaded the files to my downloads also, and this didn't help. This was suggested by my host.

[RescoCCC]

Who is your host?

[TemplateTonic]

I get the same error screen is my browsers as well.

I think my error is because after the .com/ I have another slash. So my address is:

mystore.com//index.php?main_page=download&order=18&id=9

No clue how that happened but it seems this error might be because of that path?

"This warning is often caused by a blank space or extra line at the beginning or end of a .php file."

What file would I look at?