7 messages in org.apache.tomcat.usersRE: Apache + mod_jk (ajp13) + Tomcat:...| From | Sent On | Attachments |
|---|---|---|
| Michele Milani | Dec 10, 2001 9:23 am | |
| Michele Milani | Dec 11, 2001 2:44 am | |
| Michele Milani | Dec 11, 2001 4:15 am | |
| Justin Rowles | Dec 11, 2001 4:22 am | |
| Michele Milani | Dec 11, 2001 4:34 am | |
| Craig R. McClanahan | Dec 11, 2001 9:46 am | |
| Justin Rowles | Dec 12, 2001 3:08 am |
| Subject: | RE: Apache + mod_jk (ajp13) + Tomcat: no "Expires" header in the response | |
|---|---|---|
| From: | Michele Milani (mich...@cefriel.it) | |
| Date: | Dec 11, 2001 2:44:33 am | |
| List: | org.apache.tomcat.users | |
-----Original Message----- From: Ralph Einfeldt [mailto:ralp...@uptime-isc.de] Sent: martedì 11 dicembre 2001 07:54 To: Tomcat Users List Subject: AW: Apache + mod_jk (ajp13) + Tomcat: no "Expires" header in the response
Is mod_expire enabled on the linux box ?
Yes, it is. I also add to httpd.conf these two lines:
ExpiresActive On ExpiresByType text/html "access"
Apache sets "Expires" header for HTML pages under DocumentRoot (i.e. /var/www/html/ or C:/Program Files/Apache Group/Apache/htdocs).
AFAIK apache won't set the expires header unless you use mod_expire.
You're right.
To enable expiring you have to do it on your own: <% response.setHeader("Cache-Control","no-cache"); //HTTP 1.1 response.setHeader("Pragma","no-cache"); //HTTP 1.0 response.setDateHeader("Expires", 0); //prevents caching at the proxy server %>
This only works for HTML code generated by the servlet, not for static HTML pages that reside under $TOMCAT_HOME/webapps/test. Anyway, in both cases, Apache returns always the same date! And it not the creation/modification date/time of any file under $TOMCAT_HOME/webapps/test... can it be Tomcat startup time?
Here it is an excerpt of the Ethereal output: compare the sequence of headers obtained with Apache + Tomcat under Linux and under Windows.
I didn't install Red Hat and Apache (another guy did the job), I only installed Tomcat, maybe some configuration parameter needs to be set... is it possible?
[Linux]
[From the browser I request /test/servlet/DateServlet]
C->Slinux GET /test/servlet/DateServlet HTTP/1.1 Slinux->C HTTP/1.1 200 OK Date: Tue, 11 Dec 2001 09:56:37 GMT Server: Apache/1.3.20 (Unix) (Red-Hat/Linux) mod_jk/1.1.0 mod_ssl/2.8.4 OpenSSL/0.9.6b DAV/1.0.2 PHP/4.0.6 mod_perl/1.24_01 Cache-Control: no-cache Expires: Mon, 10 Dec 2001 16:41:53 GMT
[After 3 seconds the browser refreshs requesting /test/date.html]
C->Slinux GET /test/date.html HTTP/1.1 Slinux->C HTTP/1.1 200 OK Date: Tue, 11 Dec 2001 09:56:40 GMT Server: Apache/1.3.20 (Unix) (Red-Hat/Linux) mod_jk/1.1.0 mod_ssl/2.8.4 OpenSSL/0.9.6b DAV/1.0.2 PHP/4.0.6 mod_perl/1.24_01 Last-Modified: Mon, 10 Dec 2001 16:41:53 GMT
[I click on the "Update" link]
C->Slinux GET /test/servlet/DateServlet HTTP/1.1 Slinux->C HTTP/1.1 200 OK Date: Tue, 11 Dec 2001 09:56:41 GMT Server: Apache/1.3.20 (Unix) (Red-Hat/Linux) mod_jk/1.1.0 mod_ssl/2.8.4 OpenSSL/0.9.6b DAV/1.0.2 PHP/4.0.6 mod_perl/1.24_01 Cache-Control: no-cache Expires: Mon, 10 Dec 2001 16:41:53 GMT
[After 3 seconds the browser refreshs requesting /test/date.html]
C->Slinux GET /test/date.html HTTP/1.1 Slinux->C HTTP/1.1 200 OK Date: Tue, 11 Dec 2001 09:56:44 GMT Server: Apache/1.3.20 (Unix) (Red-Hat/Linux) mod_jk/1.1.0 mod_ssl/2.8.4 OpenSSL/0.9.6b DAV/1.0.2 PHP/4.0.6 mod_perl/1.24_01 Last-Modified: Mon, 10 Dec 2001 16:41:53 GMT
[Windows]
[From the browser I request /test/servlet/DateServlet]
C->Swin GET /test/servlet/DateServlet HTTP/1.1 Swin->C HTTP/1.1 200 OK Date: Mon, 10 Dec 2001 16:59:32 GMT Server: Apache/1.3.20 (Win32) mod_jk/1.1.0
[After 3 seconds the browser refreshs requesting /test/date.html]
C->Swin GET /test/date.html HTTP/1.1 Swin->C HTTP/1.1 200 OK Date: Mon, 10 Dec 2001 16:59:35 GMT Server: Apache/1.3.20 (Win32) mod_jk/1.1.0 Last-Modified: Mon, 10 Dec 2001 16:59:32 GMT
[I click on the "Update" link]
C->Swin GET /test/servlet/DateServlet HTTP/1.1 Swin->C HTTP/1.1 200 OK Date: Mon, 10 Dec 2001 16:59:37 GMT Server: Apache/1.3.20 (Win32) mod_jk/1.1.0
[After 3 seconds the browser refreshs requesting /test/date.html]
C->Swin GET /test/date.html HTTP/1.1 Swin->C HTTP/1.1 200 OK Date: Mon, 10 Dec 2001 16:59:40 GMT Server: Apache/1.3.20 (Win32) mod_jk/1.1.0 Last-Modified: Mon, 10 Dec 2001 16:59:37 GMT
-----Ursprüngliche Nachricht----- Von: Michele Milani [mailto:mich...@cefriel.it] Gesendet: Montag, 10. Dezember 2001 18:23 An: 'tomc...@jakarta.apache.org' Betreff: RE: Apache + mod_jk (ajp13) + Tomcat: no "Expires" header in the response
This stuff is getting *really* funny! I run it under Windows and it worked. I compared HTTP headers, the problem is that:
- Apache (under Windows or Linux) does not set "Expires" header for HTML pages restituted by Tomcat - Apache _under Linux_ sets a wrong (i.e. old, not updated) "Last-Modified" header, so that the browser loads a local cached copy of the page
The time set by Apache into the "Last-Modified" header is not the time of creation/modification of any other file of my webapps/test directory, so I really can't understand how Apache sets it.
Any hint?
Cheers, Michele
-----Original Message----- From: Michele Milani Sent: lunedì 10 dicembre 2001 12:14 To: 'tomc...@jakarta.apache.org' Subject: Apache + mod_jk (ajp13) + Tomcat: no "Expires" header in the response
Dear guys,
I searched the archive and the Usenet without success.
I'm using a box with:
- Linux Red Hat 7.2 - Apache 1.3.20 - mod_jk (ajp13) - Tomcat 3.3
I developed a web application that let you browse through some static HTML pages and let you update the content of these HTML page, inserting some data in a form.
The update of the static pages is done by a servlet that rewrite the HTML file. The problem is that I can't get the last updated HTML page in my browser.
I thought it was a problem realted to caching, so I forced Apache to set the "Expires" header writing in the httpd.conf:
#ExpiresActive On #ExpiresByType text/html "access"
but this solution didn't help.
I turned on a protocol analyzer (Etheral) to try and understand what the problem was and I realized that Apache does not set the "Expires" header when the HTML page comes from Tomcat.
I think my application is not so strange: I want to save the new data inserted by the user so that the next time she requests the page she gets the last version of it.
I wrote another very simple application to explain my problem better, simply copy the following files under $TOMCAT_HOME/webapps/ and compile the servlet:
=============== test/index.html =============== <html> <head> </head> <body> <a href="servlet/DateServlet">Test</a><br> </body> </html>
===================================== test/WEB-INF/classes/DateServlet.java ===================================== import java.io.*; import java.util.*; import javax.servlet.*; import javax.servlet.http.*;
public class DateServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { try { Date now = new Date();
PrintWriter dateWriter = new PrintWriter(new FileWriter("../webapps/test/date.html"), true); dateWriter.println(now); dateWriter.println("<br>"); dateWriter.println("<a href=\"servlet/DateServlet\">Update</a>"); dateWriter.close();
response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println(now); out.println("<meta http-equiv='refresh' content='3; url=\"/test/date.html\"'></meta>");
} catch(Exception ex) { PrintWriter errorWriter = new PrintWriter(new FileWriter("../webapps/bib/error.txt"), true); ex.printStackTrace(errorWriter); errorWriter.close(); } }
}
Did anyone else experiment such problems?
Cheers, Michele
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