DOCUMENT:Q199806 16-JAN-1999 [iis] TITLE :IIS: Headers Containing White Spaces May Return a 404 Error PRODUCT :Internet Information Server PROD/VER:winnt:4.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== If a request to an Internet Information Server (IIS) Web server contains a "HOST:" entry that contains a space between the HOST and the colon (HOST :), the Web server will return a 404 error message (not found). This information is found in the headers of the request sent by the browser to the Web server. This problem does not occur with a standard browser (Netscape or Internet Explorer). CAUSE ===== All "headername:" information presented to Internet Information Server (including 'host:') is assumed to not contain a space. There is no HTTP error code for "Server Not Found," therefore the server returns a 404 error message. Additional query words: ====================================================================== Keywords : Technology : kbiisSearch kbiis400 Version : winnt:4.0 Issue type : kbprb Solution Type : kbpending ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.