Author: jsdelfino
Date: Tue Dec 5 23:11:21 2006
New Revision: 482932
URL: http://svn.apache.org/viewvc?view=rev&rev=482932
Log:
Added handling of HTTP ETags and conditional HTTP GETs to the REST binding to
enable caching of resource representations.
Modified:
incubator/tuscany/cpp/sca/runtime/extensions/rest/service/httpd/src/tuscany/sca/rest/ModREST.cpp
Modified:
incubator/tuscany/cpp/sca/runtime/extensions/rest/service/httpd/src/tuscany/sca/rest/ModREST.cpp
URL:
http://svn.apache.org/viewvc/incubator/tuscany/cpp/sca/runtime/extensions/rest/service/httpd/src/tuscany/sca/rest/ModREST.cpp?view=diff&rev=482932&r1=482931&r2=482932
==============================================================================
---
incubator/tuscany/cpp/sca/runtime/extensions/rest/service/httpd/src/tuscany/sca/rest/ModREST.cpp
(original)
+++
incubator/tuscany/cpp/sca/runtime/extensions/rest/service/httpd/src/tuscany/sca/rest/ModREST.cpp
Tue Dec 5 23:11:21 2006
@@ -31,6 +31,7 @@
#include "http_log.h"
#include "http_main.h"
#include "util_script.h"
+#include "util_md5.h"
#include "mod_core.h"
@@ -540,11 +541,31 @@
resourceDataObject->getType().getURI(),
resourceDataObject->getType().getName());
char* str = xm->save(doc);
-
- loginfo("Sending response: %s", str);
- ap_set_content_type(request, "text/xml");
- ap_rputs(str, request);
-
+
+ // Calculate an Etag hash for the response
+ char* etag = ap_md5(request->pool, (const
unsigned char*)str);
+
+ // Handle a conditional GET, if the etag
matches the etag
+ // sent by the client, we don't need to
send the whole response
+ const char* match =
apr_table_get(request->headers_in, "If-None-Match");
+ if (match != NULL && !strcmp(etag, match))
+ {
+ loginfo("REST resource matches ETag,
sending HTTP 304 response code");
+ request->status = HTTP_NOT_MODIFIED;
+ }
+ else
+ {
+ loginfo("Sending response: %s", str);
+ ap_set_content_type(request,
"text/xml");
+ apr_table_setn(request->headers_out,
"ETag", etag);
+
+ // Send an Etag header to allow
caching and
+ // conditional gets
+ char* etag = ap_md5(request->pool,
(const unsigned char*)str);
+ apr_table_setn(request->headers_out,
"ETag", etag);
+
+ ap_rputs(str, request);
+ }
}
else
{
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