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Adding "Expires" headers to improve caching client side.

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This commit is contained in:
Knut Forkalsrud 2009-11-08 11:24:59 -08:00
parent f6bea49c02
commit 984c74b63f
1 changed files with 4 additions and 1 deletions
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5
src/org/forkalsrud/album/web/AlbumServlet.java
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@ -69,7 +69,7 @@ public class AlbumServlet
if (pathInfo != null && pathInfo.startsWith(basePrefix)) { if (pathInfo != null && pathInfo.startsWith(basePrefix)) {
pathInfo = pathInfo.substring(basePrefix.length()); pathInfo = pathInfo.substring(basePrefix.length());
} else { } else {
res.sendError(HttpServletResponse.SC_NOT_FOUND); res.sendError(HttpServletResponse.SC_NOT_FOUND, "pathinfo=" + pathInfo);
return; return;
} }
@ -153,12 +153,14 @@ public class AlbumServlet
if (notModified(req, file)) { if (notModified(req, file)) {
res.setStatus(HttpServletResponse.SC_NOT_MODIFIED); res.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
res.setDateHeader("Expires", System.currentTimeMillis() + (30 * 24 * 3600 * 1000)); // 30 days
System.out.println(file.getName() + " not modified (based on date)"); System.out.println(file.getName() + " not modified (based on date)");
return; return;
} }
String fileEtag = thumbnail.getEtag() + "-" + size; String fileEtag = thumbnail.getEtag() + "-" + size;
if (etagMatches(req, fileEtag)) { if (etagMatches(req, fileEtag)) {
res.setStatus(HttpServletResponse.SC_NOT_MODIFIED); res.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
res.setDateHeader("Expires", System.currentTimeMillis() + (30 * 24 * 3600 * 1000)); // 30 days
System.out.println(file.getName() + " not modified (based on etag)"); System.out.println(file.getName() + " not modified (based on etag)");
return; return;
} }
@ -195,6 +197,7 @@ public class AlbumServlet
res.setStatus(HttpServletResponse.SC_OK); res.setStatus(HttpServletResponse.SC_OK);
res.setDateHeader("Last-Modified", file.lastModified()); res.setDateHeader("Last-Modified", file.lastModified());
res.setHeader("ETag", fileEtag); res.setHeader("ETag", fileEtag);
res.setDateHeader("Expires", System.currentTimeMillis() + (30 * 24 * 3600 * 1000)); // 30 days
res.setContentType(cimg.mimeType); res.setContentType(cimg.mimeType);
res.setContentLength(cimg.bits.length); res.setContentLength(cimg.bits.length);
res.getOutputStream().write(cimg.bits); res.getOutputStream().write(cimg.bits);