diff --git a/happstack-server.cabal b/happstack-server.cabal
--- a/happstack-server.cabal
+++ b/happstack-server.cabal
@@ -1,5 +1,5 @@
 Name:                happstack-server
-Version:             7.4.4
+Version:             7.4.5
 Synopsis:            Web related tools and services.
 Description:         Happstack Server provides an HTTP server and a rich set of functions for routing requests, handling query parameters, generating responses, working with cookies, serving files, and more. For in-depth documentation see the Happstack Crash Course <http://happstack.com/docs/crashcourse/index.html>
 License:             BSD3
diff --git a/src/Happstack/Server/FileServe/BuildingBlocks.hs b/src/Happstack/Server/FileServe/BuildingBlocks.hs
--- a/src/Happstack/Server/FileServe/BuildingBlocks.hs
+++ b/src/Happstack/Server/FileServe/BuildingBlocks.hs
@@ -718,5 +718,5 @@
 -- | Ready collection of common mime types.
 -- Except for the first two entries, the mappings come from an Ubuntu 8.04 \/etc\/mime.types file.
 mimeTypes :: MimeMap
-mimeTypes = Map.fromList [("gz","application/x-gzip"),("cabal","application/x-cabal"),("%","application/x-trash"),("323","text/h323"),("3gp","video/3gpp"),("7z","application/x-7z-compressed"),("abw","application/x-abiword"),("ai","application/postscript"),("aif","audio/x-aiff"),("aifc","audio/x-aiff"),("aiff","audio/x-aiff"),("alc","chemical/x-alchemy"),("art","image/x-jg"),("asc","text/plain"),("asf","video/x-ms-asf"),("asn","chemical/x-ncbi-asn1"),("aso","chemical/x-ncbi-asn1-binary"),("asx","video/x-ms-asf"),("atom","application/atom"),("atomcat","application/atomcat+xml"),("atomsrv","application/atomserv+xml"),("au","audio/basic"),("avi","video/x-msvideo"),("b","chemical/x-molconn-Z"),("bak","application/x-trash"),("bat","application/x-msdos-program"),("bcpio","application/x-bcpio"),("bib","text/x-bibtex"),("bin","application/octet-stream"),("bmp","image/x-ms-bmp"),("boo","text/x-boo"),("book","application/x-maker"),("bsd","chemical/x-crossfire"),("c","text/x-csrc"),("c++","text/x-c++src"),("c3d","chemical/x-chem3d"),("cab","application/x-cab"),("cac","chemical/x-cache"),("cache","chemical/x-cache"),("cap","application/cap"),("cascii","chemical/x-cactvs-binary"),("cat","application/vnd.ms-pki.seccat"),("cbin","chemical/x-cactvs-binary"),("cbr","application/x-cbr"),("cbz","application/x-cbz"),("cc","text/x-c++src"),("cdf","application/x-cdf"),("cdr","image/x-coreldraw"),("cdt","image/x-coreldrawtemplate"),("cdx","chemical/x-cdx"),("cdy","application/vnd.cinderella"),("cef","chemical/x-cxf"),("cer","chemical/x-cerius"),("chm","chemical/x-chemdraw"),("chrt","application/x-kchart"),("cif","chemical/x-cif"),("class","application/java-vm"),("cls","text/x-tex"),("cmdf","chemical/x-cmdf"),("cml","chemical/x-cml"),("cod","application/vnd.rim.cod"),("com","application/x-msdos-program"),("cpa","chemical/x-compass"),("cpio","application/x-cpio"),("cpp","text/x-c++src"),("cpt","application/mac-compactpro"),("crl","application/x-pkcs7-crl"),("crt","application/x-x509-ca-cert"),("csf","chemical/x-cache-csf"),("csh","application/x-csh"),("csm","chemical/x-csml"),("csml","chemical/x-csml"),("css","text/css"),("csv","text/csv"),("ctab","chemical/x-cactvs-binary"),("ctx","chemical/x-ctx"),("cu","application/cu-seeme"),("cub","chemical/x-gaussian-cube"),("cxf","chemical/x-cxf"),("cxx","text/x-c++src"),("d","text/x-dsrc"),("dat","chemical/x-mopac-input"),("dcr","application/x-director"),("deb","application/x-debian-package"),("dif","video/dv"),("diff","text/x-diff"),("dir","application/x-director"),("djv","image/vnd.djvu"),("djvu","image/vnd.djvu"),("dl","video/dl"),("dll","application/x-msdos-program"),("dmg","application/x-apple-diskimage"),("dms","application/x-dms"),("doc","application/msword"),("dot","application/msword"),("dv","video/dv"),("dvi","application/x-dvi"),("dx","chemical/x-jcamp-dx"),("dxr","application/x-director"),("emb","chemical/x-embl-dl-nucleotide"),("embl","chemical/x-embl-dl-nucleotide"),("eml","message/rfc822"),("ent","chemical/x-ncbi-asn1-ascii"),("eps","application/postscript"),("etx","text/x-setext"),("exe","application/x-msdos-program"),("ez","application/andrew-inset"),("fb","application/x-maker"),("fbdoc","application/x-maker"),("fch","chemical/x-gaussian-checkpoint"),("fchk","chemical/x-gaussian-checkpoint"),("fig","application/x-xfig"),("flac","application/x-flac"),("fli","video/fli"),("fm","application/x-maker"),("frame","application/x-maker"),("frm","application/x-maker"),("gal","chemical/x-gaussian-log"),("gam","chemical/x-gamess-input"),("gamin","chemical/x-gamess-input"),("gau","chemical/x-gaussian-input"),("gcd","text/x-pcs-gcd"),("gcf","application/x-graphing-calculator"),("gcg","chemical/x-gcg8-sequence"),("gen","chemical/x-genbank"),("gf","application/x-tex-gf"),("gif","image/gif"),("gjc","chemical/x-gaussian-input"),("gjf","chemical/x-gaussian-input"),("gl","video/gl"),("gnumeric","application/x-gnumeric"),("gpt","chemical/x-mopac-graph"),("gsf","application/x-font"),("gsm","audio/x-gsm"),("gtar","application/x-gtar"),("h","text/x-chdr"),("h++","text/x-c++hdr"),("hdf","application/x-hdf"),("hh","text/x-c++hdr"),("hin","chemical/x-hin"),("hpp","text/x-c++hdr"),("hqx","application/mac-binhex40"),("hs","text/x-haskell"),("hta","application/hta"),("htc","text/x-component"),("htm","text/html"),("html","text/html"),("hxx","text/x-c++hdr"),("ica","application/x-ica"),("ice","x-conference/x-cooltalk"),("ico","image/x-icon"),("ics","text/calendar"),("icz","text/calendar"),("ief","image/ief"),("iges","model/iges"),("igs","model/iges"),("iii","application/x-iphone"),("inp","chemical/x-gamess-input"),("ins","application/x-internet-signup"),("iso","application/x-iso9660-image"),("isp","application/x-internet-signup"),("ist","chemical/x-isostar"),("istr","chemical/x-isostar"),("jad","text/vnd.sun.j2me.app-descriptor"),("jar","application/java-archive"),("java","text/x-java"),("jdx","chemical/x-jcamp-dx"),("jmz","application/x-jmol"),("jng","image/x-jng"),("jnlp","application/x-java-jnlp-file"),("jpe","image/jpeg"),("jpeg","image/jpeg"),("jpg","image/jpeg"),("js","application/x-javascript"),("kar","audio/midi"),("key","application/pgp-keys"),("kil","application/x-killustrator"),("kin","chemical/x-kinemage"),("kml","application/vnd.google-earth.kml+xml"),("kmz","application/vnd.google-earth.kmz"),("kpr","application/x-kpresenter"),("kpt","application/x-kpresenter"),("ksp","application/x-kspread"),("kwd","application/x-kword"),("kwt","application/x-kword"),("latex","application/x-latex"),("lha","application/x-lha"),("lhs","text/x-literate-haskell"),("lsf","video/x-la-asf"),("lsx","video/x-la-asf"),("ltx","text/x-tex"),("lyx","application/x-lyx"),("lzh","application/x-lzh"),("lzx","application/x-lzx"),("m3u","audio/mpegurl"),("m4a","audio/mpeg"),("maker","application/x-maker"),("man","application/x-troff-man"),("mcif","chemical/x-mmcif"),("mcm","chemical/x-macmolecule"),("mdb","application/msaccess"),("me","application/x-troff-me"),("mesh","model/mesh"),("mid","audio/midi"),("midi","audio/midi"),("mif","application/x-mif"),("mm","application/x-freemind"),("mmd","chemical/x-macromodel-input"),("mmf","application/vnd.smaf"),("mml","text/mathml"),("mmod","chemical/x-macromodel-input"),("mng","video/x-mng"),("moc","text/x-moc"),("mol","chemical/x-mdl-molfile"),("mol2","chemical/x-mol2"),("moo","chemical/x-mopac-out"),("mop","chemical/x-mopac-input"),("mopcrt","chemical/x-mopac-input"),("mov","video/quicktime"),("movie","video/x-sgi-movie"),("mp2","audio/mpeg"),("mp3","audio/mpeg"),("mp4","video/mp4"),("mpc","chemical/x-mopac-input"),("mpe","video/mpeg"),("mpeg","video/mpeg"),("mpega","audio/mpeg"),("mpg","video/mpeg"),("mpga","audio/mpeg"),("ms","application/x-troff-ms"),("msh","model/mesh"),("msi","application/x-msi"),("mvb","chemical/x-mopac-vib"),("mxu","video/vnd.mpegurl"),("nb","application/mathematica"),("nc","application/x-netcdf"),("nwc","application/x-nwc"),("o","application/x-object"),("oda","application/oda"),("odb","application/vnd.oasis.opendocument.database"),("odc","application/vnd.oasis.opendocument.chart"),("odf","application/vnd.oasis.opendocument.formula"),("odg","application/vnd.oasis.opendocument.graphics"),("odi","application/vnd.oasis.opendocument.image"),("odm","application/vnd.oasis.opendocument.text-master"),("odp","application/vnd.oasis.opendocument.presentation"),("ods","application/vnd.oasis.opendocument.spreadsheet"),("odt","application/vnd.oasis.opendocument.text"),("oga","audio/ogg"),("ogg","application/ogg"),("ogv","video/ogg"),("ogx","application/ogg"),("old","application/x-trash"),("otg","application/vnd.oasis.opendocument.graphics-template"),("oth","application/vnd.oasis.opendocument.text-web"),("otp","application/vnd.oasis.opendocument.presentation-template"),("ots","application/vnd.oasis.opendocument.spreadsheet-template"),("ott","application/vnd.oasis.opendocument.text-template"),("oza","application/x-oz-application"),("p","text/x-pascal"),("p7r","application/x-pkcs7-certreqresp"),("pac","application/x-ns-proxy-autoconfig"),("pas","text/x-pascal"),("pat","image/x-coreldrawpattern"),("patch","text/x-diff"),("pbm","image/x-portable-bitmap"),("pcap","application/cap"),("pcf","application/x-font"),("pcf.Z","application/x-font"),("pcx","image/pcx"),("pdb","chemical/x-pdb"),("pdf","application/pdf"),("pfa","application/x-font"),("pfb","application/x-font"),("pgm","image/x-portable-graymap"),("pgn","application/x-chess-pgn"),("pgp","application/pgp-signature"),("php","application/x-httpd-php"),("php3","application/x-httpd-php3"),("php3p","application/x-httpd-php3-preprocessed"),("php4","application/x-httpd-php4"),("phps","application/x-httpd-php-source"),("pht","application/x-httpd-php"),("phtml","application/x-httpd-php"),("pk","application/x-tex-pk"),("pl","text/x-perl"),("pls","audio/x-scpls"),("pm","text/x-perl"),("png","image/png"),("pnm","image/x-portable-anymap"),("pot","text/plain"),("ppm","image/x-portable-pixmap"),("pps","application/vnd.ms-powerpoint"),("ppt","application/vnd.ms-powerpoint"),("prf","application/pics-rules"),("prt","chemical/x-ncbi-asn1-ascii"),("ps","application/postscript"),("psd","image/x-photoshop"),("py","text/x-python"),("pyc","application/x-python-code"),("pyo","application/x-python-code"),("qt","video/quicktime"),("qtl","application/x-quicktimeplayer"),("ra","audio/x-pn-realaudio"),("ram","audio/x-pn-realaudio"),("rar","application/rar"),("ras","image/x-cmu-raster"),("rd","chemical/x-mdl-rdfile"),("rdf","application/rdf+xml"),("rgb","image/x-rgb"),("rhtml","application/x-httpd-eruby"),("rm","audio/x-pn-realaudio"),("roff","application/x-troff"),("ros","chemical/x-rosdal"),("rpm","application/x-redhat-package-manager"),("rss","application/rss+xml"),("rtf","application/rtf"),("rtx","text/richtext"),("rxn","chemical/x-mdl-rxnfile"),("sct","text/scriptlet"),("sd","chemical/x-mdl-sdfile"),("sd2","audio/x-sd2"),("sda","application/vnd.stardivision.draw"),("sdc","application/vnd.stardivision.calc"),("sdd","application/vnd.stardivision.impress"),("sdf","application/vnd.stardivision.math"),("sds","application/vnd.stardivision.chart"),("sdw","application/vnd.stardivision.writer"),("ser","application/java-serialized-object"),("sgf","application/x-go-sgf"),("sgl","application/vnd.stardivision.writer-global"),("sh","application/x-sh"),("shar","application/x-shar"),("shtml","text/html"),("sid","audio/prs.sid"),("sik","application/x-trash"),("silo","model/mesh"),("sis","application/vnd.symbian.install"),("sisx","x-epoc/x-sisx-app"),("sit","application/x-stuffit"),("sitx","application/x-stuffit"),("skd","application/x-koan"),("skm","application/x-koan"),("skp","application/x-koan"),("skt","application/x-koan"),("smi","application/smil"),("smil","application/smil"),("snd","audio/basic"),("spc","chemical/x-galactic-spc"),("spl","application/futuresplash"),("spx","audio/ogg"),("src","application/x-wais-source"),("stc","application/vnd.sun.xml.calc.template"),("std","application/vnd.sun.xml.draw.template"),("sti","application/vnd.sun.xml.impress.template"),("stl","application/vnd.ms-pki.stl"),("stw","application/vnd.sun.xml.writer.template"),("sty","text/x-tex"),("sv4cpio","application/x-sv4cpio"),("sv4crc","application/x-sv4crc"),("svg","image/svg+xml"),("svgz","image/svg+xml"),("sw","chemical/x-swissprot"),("swf","application/x-shockwave-flash"),("swfl","application/x-shockwave-flash"),("sxc","application/vnd.sun.xml.calc"),("sxd","application/vnd.sun.xml.draw"),("sxg","application/vnd.sun.xml.writer.global"),("sxi","application/vnd.sun.xml.impress"),("sxm","application/vnd.sun.xml.math"),("sxw","application/vnd.sun.xml.writer"),("t","application/x-troff"),("tar","application/x-tar"),("taz","application/x-gtar"),("tcl","application/x-tcl"),("tex","text/x-tex"),("texi","application/x-texinfo"),("texinfo","application/x-texinfo"),("text","text/plain"),("tgf","chemical/x-mdl-tgf"),("tgz","application/x-gtar"),("tif","image/tiff"),("tiff","image/tiff"),("tk","text/x-tcl"),("tm","text/texmacs"),("torrent","application/x-bittorrent"),("tr","application/x-troff"),("ts","text/texmacs"),("tsp","application/dsptype"),("tsv","text/tab-separated-values"),("txt","text/plain"),("udeb","application/x-debian-package"),("uls","text/iuls"),("ustar","application/x-ustar"),("val","chemical/x-ncbi-asn1-binary"),("vcd","application/x-cdlink"),("vcf","text/x-vcard"),("vcs","text/x-vcalendar"),("vmd","chemical/x-vmd"),("vms","chemical/x-vamas-iso14976"),("vrm","x-world/x-vrml"),("vrml","model/vrml"),("vsd","application/vnd.visio"),("wad","application/x-doom"),("wav","audio/x-wav"),("wax","audio/x-ms-wax"),("wbmp","image/vnd.wap.wbmp"),("wbxml","application/vnd.wap.wbxml"),("wk","application/x-123"),("wm","video/x-ms-wm"),("wma","audio/x-ms-wma"),("wmd","application/x-ms-wmd"),("wml","text/vnd.wap.wml"),("wmlc","application/vnd.wap.wmlc"),("wmls","text/vnd.wap.wmlscript"),("wmlsc","application/vnd.wap.wmlscriptc"),("wmv","video/x-ms-wmv"),("wmx","video/x-ms-wmx"),("wmz","application/x-ms-wmz"),("wp5","application/wordperfect5.1"),("wpd","application/wordperfect"),("wrl","model/vrml"),("wsc","text/scriptlet"),("wvx","video/x-ms-wvx"),("wz","application/x-wingz"),("xbm","image/x-xbitmap"),("xcf","application/x-xcf"),("xht","application/xhtml+xml"),("xhtml","application/xhtml+xml"),("xlb","application/vnd.ms-excel"),("xls","application/vnd.ms-excel"),("xlt","application/vnd.ms-excel"),("xml","application/xml"),("xpi","application/x-xpinstall"),("xpm","image/x-xpixmap"),("xsl","application/xml"),("xtel","chemical/x-xtel"),("xul","application/vnd.mozilla.xul+xml"),("xwd","image/x-xwindowdump"),("xyz","chemical/x-xyz"),("zip","application/zip"),("zmt","chemical/x-mopac-input"),("~","application/x-trash")]
+mimeTypes = Map.fromList [("gz","application/x-gzip"),("cabal","text/x-cabal"),("%","application/x-trash"),("323","text/h323"),("3gp","video/3gpp"),("7z","application/x-7z-compressed"),("abw","application/x-abiword"),("ai","application/postscript"),("aif","audio/x-aiff"),("aifc","audio/x-aiff"),("aiff","audio/x-aiff"),("alc","chemical/x-alchemy"),("art","image/x-jg"),("asc","text/plain"),("asf","video/x-ms-asf"),("asn","chemical/x-ncbi-asn1"),("aso","chemical/x-ncbi-asn1-binary"),("asx","video/x-ms-asf"),("atom","application/atom"),("atomcat","application/atomcat+xml"),("atomsrv","application/atomserv+xml"),("au","audio/basic"),("avi","video/x-msvideo"),("b","chemical/x-molconn-Z"),("bak","application/x-trash"),("bat","application/x-msdos-program"),("bcpio","application/x-bcpio"),("bib","text/x-bibtex"),("bin","application/octet-stream"),("bmp","image/x-ms-bmp"),("boo","text/x-boo"),("book","application/x-maker"),("bsd","chemical/x-crossfire"),("c","text/x-csrc"),("c++","text/x-c++src"),("c3d","chemical/x-chem3d"),("cab","application/x-cab"),("cac","chemical/x-cache"),("cache","chemical/x-cache"),("cap","application/cap"),("cascii","chemical/x-cactvs-binary"),("cat","application/vnd.ms-pki.seccat"),("cbin","chemical/x-cactvs-binary"),("cbr","application/x-cbr"),("cbz","application/x-cbz"),("cc","text/x-c++src"),("cdf","application/x-cdf"),("cdr","image/x-coreldraw"),("cdt","image/x-coreldrawtemplate"),("cdx","chemical/x-cdx"),("cdy","application/vnd.cinderella"),("cef","chemical/x-cxf"),("cer","chemical/x-cerius"),("chm","chemical/x-chemdraw"),("chrt","application/x-kchart"),("cif","chemical/x-cif"),("class","application/java-vm"),("cls","text/x-tex"),("cmdf","chemical/x-cmdf"),("cml","chemical/x-cml"),("cod","application/vnd.rim.cod"),("com","application/x-msdos-program"),("cpa","chemical/x-compass"),("cpio","application/x-cpio"),("cpp","text/x-c++src"),("cpt","application/mac-compactpro"),("crl","application/x-pkcs7-crl"),("crt","application/x-x509-ca-cert"),("csf","chemical/x-cache-csf"),("csh","application/x-csh"),("csm","chemical/x-csml"),("csml","chemical/x-csml"),("css","text/css"),("csv","text/csv"),("ctab","chemical/x-cactvs-binary"),("ctx","chemical/x-ctx"),("cu","application/cu-seeme"),("cub","chemical/x-gaussian-cube"),("cxf","chemical/x-cxf"),("cxx","text/x-c++src"),("d","text/x-dsrc"),("dat","chemical/x-mopac-input"),("dcr","application/x-director"),("deb","application/x-debian-package"),("dif","video/dv"),("diff","text/x-diff"),("dir","application/x-director"),("djv","image/vnd.djvu"),("djvu","image/vnd.djvu"),("dl","video/dl"),("dll","application/x-msdos-program"),("dmg","application/x-apple-diskimage"),("dms","application/x-dms"),("doc","application/msword"),("dot","application/msword"),("dv","video/dv"),("dvi","application/x-dvi"),("dx","chemical/x-jcamp-dx"),("dxr","application/x-director"),("emb","chemical/x-embl-dl-nucleotide"),("embl","chemical/x-embl-dl-nucleotide"),("eml","message/rfc822"),("ent","chemical/x-ncbi-asn1-ascii"),("eps","application/postscript"),("etx","text/x-setext"),("exe","application/x-msdos-program"),("ez","application/andrew-inset"),("fb","application/x-maker"),("fbdoc","application/x-maker"),("fch","chemical/x-gaussian-checkpoint"),("fchk","chemical/x-gaussian-checkpoint"),("fig","application/x-xfig"),("flac","application/x-flac"),("fli","video/fli"),("fm","application/x-maker"),("frame","application/x-maker"),("frm","application/x-maker"),("gal","chemical/x-gaussian-log"),("gam","chemical/x-gamess-input"),("gamin","chemical/x-gamess-input"),("gau","chemical/x-gaussian-input"),("gcd","text/x-pcs-gcd"),("gcf","application/x-graphing-calculator"),("gcg","chemical/x-gcg8-sequence"),("gen","chemical/x-genbank"),("gf","application/x-tex-gf"),("gif","image/gif"),("gjc","chemical/x-gaussian-input"),("gjf","chemical/x-gaussian-input"),("gl","video/gl"),("gnumeric","application/x-gnumeric"),("gpt","chemical/x-mopac-graph"),("gsf","application/x-font"),("gsm","audio/x-gsm"),("gtar","application/x-gtar"),("h","text/x-chdr"),("h++","text/x-c++hdr"),("hdf","application/x-hdf"),("hh","text/x-c++hdr"),("hin","chemical/x-hin"),("hpp","text/x-c++hdr"),("hqx","application/mac-binhex40"),("hs","text/x-haskell"),("hta","application/hta"),("htc","text/x-component"),("htm","text/html"),("html","text/html"),("hxx","text/x-c++hdr"),("ica","application/x-ica"),("ice","x-conference/x-cooltalk"),("ico","image/x-icon"),("ics","text/calendar"),("icz","text/calendar"),("ief","image/ief"),("iges","model/iges"),("igs","model/iges"),("iii","application/x-iphone"),("inp","chemical/x-gamess-input"),("ins","application/x-internet-signup"),("iso","application/x-iso9660-image"),("isp","application/x-internet-signup"),("ist","chemical/x-isostar"),("istr","chemical/x-isostar"),("jad","text/vnd.sun.j2me.app-descriptor"),("jar","application/java-archive"),("java","text/x-java"),("jdx","chemical/x-jcamp-dx"),("jmz","application/x-jmol"),("jng","image/x-jng"),("jnlp","application/x-java-jnlp-file"),("jpe","image/jpeg"),("jpeg","image/jpeg"),("jpg","image/jpeg"),("js","application/x-javascript"),("kar","audio/midi"),("key","application/pgp-keys"),("kil","application/x-killustrator"),("kin","chemical/x-kinemage"),("kml","application/vnd.google-earth.kml+xml"),("kmz","application/vnd.google-earth.kmz"),("kpr","application/x-kpresenter"),("kpt","application/x-kpresenter"),("ksp","application/x-kspread"),("kwd","application/x-kword"),("kwt","application/x-kword"),("latex","application/x-latex"),("lha","application/x-lha"),("lhs","text/x-literate-haskell"),("lsf","video/x-la-asf"),("lsx","video/x-la-asf"),("ltx","text/x-tex"),("lyx","application/x-lyx"),("lzh","application/x-lzh"),("lzx","application/x-lzx"),("m3u","audio/mpegurl"),("m4a","audio/mpeg"),("maker","application/x-maker"),("man","application/x-troff-man"),("mcif","chemical/x-mmcif"),("mcm","chemical/x-macmolecule"),("mdb","application/msaccess"),("me","application/x-troff-me"),("mesh","model/mesh"),("mid","audio/midi"),("midi","audio/midi"),("mif","application/x-mif"),("mm","application/x-freemind"),("mmd","chemical/x-macromodel-input"),("mmf","application/vnd.smaf"),("mml","text/mathml"),("mmod","chemical/x-macromodel-input"),("mng","video/x-mng"),("moc","text/x-moc"),("mol","chemical/x-mdl-molfile"),("mol2","chemical/x-mol2"),("moo","chemical/x-mopac-out"),("mop","chemical/x-mopac-input"),("mopcrt","chemical/x-mopac-input"),("mov","video/quicktime"),("movie","video/x-sgi-movie"),("mp2","audio/mpeg"),("mp3","audio/mpeg"),("mp4","video/mp4"),("mpc","chemical/x-mopac-input"),("mpe","video/mpeg"),("mpeg","video/mpeg"),("mpega","audio/mpeg"),("mpg","video/mpeg"),("mpga","audio/mpeg"),("ms","application/x-troff-ms"),("msh","model/mesh"),("msi","application/x-msi"),("mvb","chemical/x-mopac-vib"),("mxu","video/vnd.mpegurl"),("nb","application/mathematica"),("nc","application/x-netcdf"),("nwc","application/x-nwc"),("o","application/x-object"),("oda","application/oda"),("odb","application/vnd.oasis.opendocument.database"),("odc","application/vnd.oasis.opendocument.chart"),("odf","application/vnd.oasis.opendocument.formula"),("odg","application/vnd.oasis.opendocument.graphics"),("odi","application/vnd.oasis.opendocument.image"),("odm","application/vnd.oasis.opendocument.text-master"),("odp","application/vnd.oasis.opendocument.presentation"),("ods","application/vnd.oasis.opendocument.spreadsheet"),("odt","application/vnd.oasis.opendocument.text"),("oga","audio/ogg"),("ogg","application/ogg"),("ogv","video/ogg"),("ogx","application/ogg"),("old","application/x-trash"),("otg","application/vnd.oasis.opendocument.graphics-template"),("oth","application/vnd.oasis.opendocument.text-web"),("otp","application/vnd.oasis.opendocument.presentation-template"),("ots","application/vnd.oasis.opendocument.spreadsheet-template"),("ott","application/vnd.oasis.opendocument.text-template"),("oza","application/x-oz-application"),("p","text/x-pascal"),("p7r","application/x-pkcs7-certreqresp"),("pac","application/x-ns-proxy-autoconfig"),("pas","text/x-pascal"),("pat","image/x-coreldrawpattern"),("patch","text/x-diff"),("pbm","image/x-portable-bitmap"),("pcap","application/cap"),("pcf","application/x-font"),("pcf.Z","application/x-font"),("pcx","image/pcx"),("pdb","chemical/x-pdb"),("pdf","application/pdf"),("pfa","application/x-font"),("pfb","application/x-font"),("pgm","image/x-portable-graymap"),("pgn","application/x-chess-pgn"),("pgp","application/pgp-signature"),("php","application/x-httpd-php"),("php3","application/x-httpd-php3"),("php3p","application/x-httpd-php3-preprocessed"),("php4","application/x-httpd-php4"),("phps","application/x-httpd-php-source"),("pht","application/x-httpd-php"),("phtml","application/x-httpd-php"),("pk","application/x-tex-pk"),("pl","text/x-perl"),("pls","audio/x-scpls"),("pm","text/x-perl"),("png","image/png"),("pnm","image/x-portable-anymap"),("pot","text/plain"),("ppm","image/x-portable-pixmap"),("pps","application/vnd.ms-powerpoint"),("ppt","application/vnd.ms-powerpoint"),("prf","application/pics-rules"),("prt","chemical/x-ncbi-asn1-ascii"),("ps","application/postscript"),("psd","image/x-photoshop"),("py","text/x-python"),("pyc","application/x-python-code"),("pyo","application/x-python-code"),("qt","video/quicktime"),("qtl","application/x-quicktimeplayer"),("ra","audio/x-pn-realaudio"),("ram","audio/x-pn-realaudio"),("rar","application/rar"),("ras","image/x-cmu-raster"),("rd","chemical/x-mdl-rdfile"),("rdf","application/rdf+xml"),("rgb","image/x-rgb"),("rhtml","application/x-httpd-eruby"),("rm","audio/x-pn-realaudio"),("roff","application/x-troff"),("ros","chemical/x-rosdal"),("rpm","application/x-redhat-package-manager"),("rss","application/rss+xml"),("rtf","application/rtf"),("rtx","text/richtext"),("rxn","chemical/x-mdl-rxnfile"),("sct","text/scriptlet"),("sd","chemical/x-mdl-sdfile"),("sd2","audio/x-sd2"),("sda","application/vnd.stardivision.draw"),("sdc","application/vnd.stardivision.calc"),("sdd","application/vnd.stardivision.impress"),("sdf","application/vnd.stardivision.math"),("sds","application/vnd.stardivision.chart"),("sdw","application/vnd.stardivision.writer"),("ser","application/java-serialized-object"),("sgf","application/x-go-sgf"),("sgl","application/vnd.stardivision.writer-global"),("sh","application/x-sh"),("shar","application/x-shar"),("shtml","text/html"),("sid","audio/prs.sid"),("sik","application/x-trash"),("silo","model/mesh"),("sis","application/vnd.symbian.install"),("sisx","x-epoc/x-sisx-app"),("sit","application/x-stuffit"),("sitx","application/x-stuffit"),("skd","application/x-koan"),("skm","application/x-koan"),("skp","application/x-koan"),("skt","application/x-koan"),("smi","application/smil"),("smil","application/smil"),("snd","audio/basic"),("spc","chemical/x-galactic-spc"),("spl","application/futuresplash"),("spx","audio/ogg"),("src","application/x-wais-source"),("stc","application/vnd.sun.xml.calc.template"),("std","application/vnd.sun.xml.draw.template"),("sti","application/vnd.sun.xml.impress.template"),("stl","application/vnd.ms-pki.stl"),("stw","application/vnd.sun.xml.writer.template"),("sty","text/x-tex"),("sv4cpio","application/x-sv4cpio"),("sv4crc","application/x-sv4crc"),("svg","image/svg+xml"),("svgz","image/svg+xml"),("sw","chemical/x-swissprot"),("swf","application/x-shockwave-flash"),("swfl","application/x-shockwave-flash"),("sxc","application/vnd.sun.xml.calc"),("sxd","application/vnd.sun.xml.draw"),("sxg","application/vnd.sun.xml.writer.global"),("sxi","application/vnd.sun.xml.impress"),("sxm","application/vnd.sun.xml.math"),("sxw","application/vnd.sun.xml.writer"),("t","application/x-troff"),("tar","application/x-tar"),("taz","application/x-gtar"),("tcl","application/x-tcl"),("tex","text/x-tex"),("texi","application/x-texinfo"),("texinfo","application/x-texinfo"),("text","text/plain"),("tgf","chemical/x-mdl-tgf"),("tgz","application/x-gtar"),("tif","image/tiff"),("tiff","image/tiff"),("tk","text/x-tcl"),("tm","text/texmacs"),("torrent","application/x-bittorrent"),("tr","application/x-troff"),("ts","text/texmacs"),("tsp","application/dsptype"),("tsv","text/tab-separated-values"),("txt","text/plain"),("udeb","application/x-debian-package"),("uls","text/iuls"),("ustar","application/x-ustar"),("val","chemical/x-ncbi-asn1-binary"),("vcd","application/x-cdlink"),("vcf","text/x-vcard"),("vcs","text/x-vcalendar"),("vmd","chemical/x-vmd"),("vms","chemical/x-vamas-iso14976"),("vrm","x-world/x-vrml"),("vrml","model/vrml"),("vsd","application/vnd.visio"),("wad","application/x-doom"),("wav","audio/x-wav"),("wax","audio/x-ms-wax"),("wbmp","image/vnd.wap.wbmp"),("wbxml","application/vnd.wap.wbxml"),("wk","application/x-123"),("wm","video/x-ms-wm"),("wma","audio/x-ms-wma"),("wmd","application/x-ms-wmd"),("wml","text/vnd.wap.wml"),("wmlc","application/vnd.wap.wmlc"),("wmls","text/vnd.wap.wmlscript"),("wmlsc","application/vnd.wap.wmlscriptc"),("wmv","video/x-ms-wmv"),("wmx","video/x-ms-wmx"),("wmz","application/x-ms-wmz"),("wp5","application/wordperfect5.1"),("wpd","application/wordperfect"),("wrl","model/vrml"),("wsc","text/scriptlet"),("wvx","video/x-ms-wvx"),("wz","application/x-wingz"),("xbm","image/x-xbitmap"),("xcf","application/x-xcf"),("xht","application/xhtml+xml"),("xhtml","application/xhtml+xml"),("xlb","application/vnd.ms-excel"),("xls","application/vnd.ms-excel"),("xlt","application/vnd.ms-excel"),("xml","application/xml"),("xpi","application/x-xpinstall"),("xpm","image/x-xpixmap"),("xsl","application/xml"),("xtel","chemical/x-xtel"),("xul","application/vnd.mozilla.xul+xml"),("xwd","image/x-xwindowdump"),("xyz","chemical/x-xyz"),("zip","application/zip"),("zmt","chemical/x-mopac-input"),("~","application/x-trash")]
 
diff --git a/src/Happstack/Server/Internal/Compression.hs b/src/Happstack/Server/Internal/Compression.hs
--- a/src/Happstack/Server/Internal/Compression.hs
+++ b/src/Happstack/Server/Internal/Compression.hs
@@ -88,7 +88,9 @@
 compressWithFilter compressor encoding identityAllowed =
     composeFilter $ \r ->
         case r of
-          Response{} -> setHeader "Content-Encoding" encoding $ r {rsBody = compressor $ rsBody r}
+          Response{} -> setHeader "Content-Encoding" encoding          $
+                        setHeader "Vary"             "Accept-Encoding" $
+                         r {rsBody = compressor $ rsBody r}
           _ | identityAllowed -> r
             | otherwise       -> (toResponse "") { rsCode = 406 }