FYI, nginx has not problems passing filenames with spaces along:


# curl -I http://direct-apache/content-disposition-header.php
HTTP/1.1 200 OK
Date: Mon, 24 Mar 2014 19:40:22 GMT
Server: Apache/2.4.2 (Win32) OpenSSL/1.0.1c PHP/5.4.4
X-Powered-By: PHP/5.4.4
Cache-Control: no-store, no-cache
Connection: keep-alive
Content-Disposition: attachment; filename="zcs error.docx"
Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document; name="zcs error.docx"


# curl -I "http://nginx-rev-proxying/content-disposition-header.php"
HTTP/1.1 200 OK
Server: nginx/1.4.7
Date: Mon, 24 Mar 2014 19:41:03 GMT
Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document; name="zcs error.docx"
Connection: keep-alive
X-Powered-By: PHP/5.4.4
Cache-Control: no-store, no-cache
Content-Disposition: attachment; filename="zcs error.docx"
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