Changeset 1739 for draft-ietf-httpbis/latest/p6-cache.html

Timestamp:

Jul 8, 2012, 7:50:41 AM (7 years ago)

Author:

julian.reschke@…

Message:

Work-in-progress: hyperlink header field definitions(P4)

File:

• draft-ietf-httpbis/latest/p6-cache.html (modified) (6 diffs)

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

@@ -769 +769 @@
       </p>
       <ul class="empty">
-         <li>A protocol element (e.g., an entity-tag or a Last-Modified time) that is used to find out whether a stored response is an
-            equivalent copy of a representation. See <a href="p4-conditional.html#weak.and.strong.validators" title="Weak versus Strong">Section 2.1</a> of <a href="#Part4" id="rfc.xref.Part4.1"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>.
+         <li>A protocol element (e.g., an entity-tag or a <a href="p4-conditional.html#header.last-modified" class="smpl">Last-Modified</a> time) that is used to find out whether a stored response is an equivalent copy of a representation. See <a href="p4-conditional.html#weak.and.strong.validators" title="Weak versus Strong">Section 2.1</a> of <a href="#Part4" id="rfc.xref.Part4.1"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>.
          </li>
       </ul>
@@ -777 +776 @@
       <ul class="empty">
          <li>A validator that is defined by the origin server such that its current value will change if the representation body changes;
-            i.e., an entity-tag that is not marked as weak (<a href="p4-conditional.html#header.etag" title="ETag">Section 2.3</a> of <a href="#Part4" id="rfc.xref.Part4.2"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>) or, if no entity-tag is provided, a Last-Modified value that is strong in the sense defined by <a href="p4-conditional.html#lastmod.comparison" title="Comparison">Section 2.2.2</a> of <a href="#Part4" id="rfc.xref.Part4.3"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>.
+            i.e., an entity-tag that is not marked as weak (<a href="p4-conditional.html#header.etag" title="ETag">Section 2.3</a> of <a href="#Part4" id="rfc.xref.Part4.2"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>) or, if no entity-tag is provided, a <a href="p4-conditional.html#header.last-modified" class="smpl">Last-Modified</a> value that is strong in the sense defined by <a href="p4-conditional.html#lastmod.comparison" title="Comparison">Section 2.2.2</a> of <a href="#Part4" id="rfc.xref.Part4.3"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>.
          </li>
       </ul>
@@ -932 +931 @@
       </p>
       <p id="rfc.section.2.3.p.4">Since origin servers do not always provide explicit expiration times, a cache <em class="bcp14">MAY</em> assign a heuristic expiration time when an explicit time is not specified, employing algorithms that use other header field
-         values (such as the Last-Modified time) to estimate a plausible expiration time. This specification does not provide specific
-         algorithms, but does impose worst-case constraints on their results.
+         values (such as the <a href="p4-conditional.html#header.last-modified" class="smpl">Last-Modified</a> time) to estimate a plausible expiration time. This specification does not provide specific algorithms, but does impose worst-case
+         constraints on their results.
       </p>
       <div id="rfc.figure.u.4"></div> 
@@ -969 +968 @@
          present.
       </p>
-      <p id="rfc.section.2.3.1.1.p.3">Also, if the response has a Last-Modified header field (<a href="p4-conditional.html#header.last-modified" title="Last-Modified">Section 2.2</a> of <a href="#Part4" id="rfc.xref.Part4.4"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>), caches are encouraged to use a heuristic expiration value that is no more than some fraction of the interval since that
+      <p id="rfc.section.2.3.1.1.p.3">Also, if the response has a <a href="p4-conditional.html#header.last-modified" class="smpl">Last-Modified</a> header field (<a href="p4-conditional.html#header.last-modified" title="Last-Modified">Section 2.2</a> of <a href="#Part4" id="rfc.xref.Part4.4"><cite title="HTTP/1.1, part 4: Conditional Requests">[Part4]</cite></a>), caches are encouraged to use a heuristic expiration value that is no more than some fraction of the interval since that
          time. A typical setting of this fraction might be 10%.
       </p>
@@ -1074 +1073 @@
          update it. This process is known as "validating" or "revalidating" the stored response.
       </p>
-      <p id="rfc.section.2.4.p.2">When sending such a conditional request, a cache adds an If-Modified-Since header field whose value is that of the Last-Modified
-         header field from the selected (see <a href="#caching.negotiated.responses" title="Caching Negotiated Responses">Section&nbsp;2.8</a>) stored response, if available.
-      </p>
-      <p id="rfc.section.2.4.p.3">Additionally, a cache can add an If-None-Match header field whose value is that of the ETag header field(s) from all responses
-         stored for the requested URI, if present. However, if any of the stored responses contains only partial content, the cache
-         shouldn't include its entity-tag in the If-None-Match header field unless the request is for a range that would be fully satisfied
-         by that stored response.
+      <p id="rfc.section.2.4.p.2">When sending such a conditional request, a cache adds an <a href="p4-conditional.html#header.if-modified-since" class="smpl">If-Modified-Since</a> header field whose value is that of the <a href="p4-conditional.html#header.last-modified" class="smpl">Last-Modified</a> header field from the selected (see <a href="#caching.negotiated.responses" title="Caching Negotiated Responses">Section&nbsp;2.8</a>) stored response, if available.
+      </p>
+      <p id="rfc.section.2.4.p.3">Additionally, a cache can add an <a href="p4-conditional.html#header.if-none-match" class="smpl">If-None-Match</a> header field whose value is that of the <a href="p4-conditional.html#header.etag" class="smpl">ETag</a> header field(s) from all responses stored for the requested URI, if present. However, if any of the stored responses contains
+         only partial content, the cache shouldn't include its entity-tag in the If-None-Match header field unless the request is for
+         a range that would be fully satisfied by that stored response.
       </p>
       <p id="rfc.section.2.4.p.4">Cache handling of a response to a conditional request is dependent upon its status code:</p>
@@ -1124 +1121 @@
          a body. This property of HEAD responses is used to both invalidate and update cached GET responses.
       </p>
-      <p id="rfc.section.2.5.p.2">If one or more stored GET responses can be selected (as per <a href="#caching.negotiated.responses" title="Caching Negotiated Responses">Section&nbsp;2.8</a>) for a HEAD request, and the Content-Length, ETag or Last-Modified value of a HEAD response differs from that in a selected
-         GET response, the cache <em class="bcp14">MUST</em> consider that selected response to be stale.
-      </p>
-      <p id="rfc.section.2.5.p.3">If the Content-Length, ETag and Last-Modified values of a HEAD response (when present) are the same as that in a selected
-         GET response (as per <a href="#caching.negotiated.responses" title="Caching Negotiated Responses">Section&nbsp;2.8</a>), the cache <em class="bcp14">SHOULD</em> update the remaining headers in the stored response using the following rules: 
+      <p id="rfc.section.2.5.p.2">If one or more stored GET responses can be selected (as per <a href="#caching.negotiated.responses" title="Caching Negotiated Responses">Section&nbsp;2.8</a>) for a HEAD request, and the Content-Length, <a href="p4-conditional.html#header.etag" class="smpl">ETag</a> or <a href="p4-conditional.html#header.last-modified" class="smpl">Last-Modified</a> value of a HEAD response differs from that in a selected GET response, the cache <em class="bcp14">MUST</em> consider that selected response to be stale.
+      </p>
+      <p id="rfc.section.2.5.p.3">If the Content-Length, <a href="p4-conditional.html#header.etag" class="smpl">ETag</a> and <a href="p4-conditional.html#header.last-modified" class="smpl">Last-Modified</a> values of a HEAD response (when present) are the same as that in a selected GET response (as per <a href="#caching.negotiated.responses" title="Caching Negotiated Responses">Section&nbsp;2.8</a>), the cache <em class="bcp14">SHOULD</em> update the remaining headers in the stored response using the following rules: 
       </p>
       <ul>