Changeset 786 for draft-ietf-httpbis/latest/p6-cache.xml

Timestamp:

Mar 10, 2010, 7:29:39 AM (10 years ago)

Author:

julian.reschke@…

Message:

re-organize field descriptions and pseudo-code for age calculation, preparing for work on #29.

File:

• draft-ietf-httpbis/latest/p6-cache.xml (modified) (4 diffs)

draft-ietf-httpbis/latest/p6-cache.xml

@@ -685 +685 @@
   A response's age can be calculated in two entirely independent ways:
   <list style="numbers">
-    <t>now minus date_value, if the local clock is reasonably well synchronized to the
+    <t>the "apparent_age": response_time minus date_value, if the local clock is reasonably well synchronized to the
       origin server's clock. If the result is negative, the result is replaced by zero.</t>
     <t>age_value, if all of the caches along the response path implement HTTP/1.1.</t>
@@ -693 +693 @@
 <preamble>These are combined as</preamble>
 <artwork type="code">
-  corrected_received_age = max(now - date_value, age_value)
+  apparent_age = max(0, response_time - date_value);
+  corrected_received_age = max(apparent_age, age_value);
 </artwork></figure>
 <t>
@@ -700 +701 @@
 </t>
 <figure><artwork type="code">
-  corrected_initial_age = corrected_received_age 
-                          + (now - request_time)
+  response_delay = response_time - request_time;
+  corrected_initial_age = corrected_received_age + response_delay;
 </artwork></figure>
 <t>
@@ -708 +709 @@
   the corrected_initial_age.
 </t>
-<figure>
-<preamble>With these definitions, the current_age can be calculated as per:</preamble>
-<artwork type="code">
-  apparent_age = max(0, response_time - date_value);
-  corrected_received_age = max(apparent_age, age_value);
-  response_delay = response_time - request_time;
-  corrected_initial_age = corrected_received_age + response_delay;
+<figure><artwork type="code">
   resident_time = now - response_time;
-  current_age   = corrected_initial_age + resident_time;
+  current_age = corrected_initial_age + resident_time;
 </artwork></figure>
 </section>