RFC 2616 HTTP/1.1 June, 1999
Fielding, et al Standards Track [Page 5]
13.2.5 Disambiguating Expiration Values ....................................................................................53
13.2.6 Disambiguating Multiple Responses..................................................................................53
13.3 Validation Model.......................................................................................................................53
13.3.1 Last-Modified Dates ..........................................................................................................54
13.3.2 Entity Tag Cache Validators..............................................................................................54
13.3.3 Weak and Strong Validators..............................................................................................54
13.3.4 Rules for When to Use Entity Tags and Last-Modified Dates...........................................56
13.3.5 Non-validating Conditionals..............................................................................................57
13.4 Response Cacheability...............................................................................................................57
13.5 Constructing Responses From Caches.......................................................................................57
13.5.1 End-to-end and Hop-by-hop Headers ................................................................................58
13.5.2 Non-modifiable Headers....................................................................................................58
13.5.3 Combining Headers ...........................................................................................................59
13.5.4 Combining Byte Ranges ....................................................................................................59
13.6 Caching Negotiated Responses..................................................................................................60
13.7 Shared and Non-Shared Caches.................................................................................................60
13.8 Errors or Incomplete Response Cache Behavior .......................................................................61
13.9 Side Effects of GET and HEAD................................................................................................61
13.10 Invalidation After Updates or Deletions................................................................................61
13.11 Write-Through Mandatory.....................................................................................................61
13.12 Cache Replacement................................................................................................................62
13.13 History Lists...........................................................................................................................62
14 Header Field Definitions .............................................................................................................62
14.1 Accept........................................................................................................................................62
14.2 Accept-Charset...........................................................................................................................64
14.3 Accept-Encoding .......................................................................................................................64
14.4 Accept-Language.......................................................................................................................65
14.5 Accept-Ranges...........................................................................................................................66
14.6 Age.............................................................................................................................................66
14.7 Allow.........................................................................................................................................66
14.8 Authorization.............................................................................................................................66
14.9 Cache-Control............................................................................................................................67
14.9.1 What is Cacheable .............................................................................................................68
14.9.2 What May be Stored by Caches.........................................................................................69
14.9.3 Modifications of the Basic Expiration Mechanism............................................................69
14.9.4 Cache Revalidation and Reload Controls...........................................................................70
14.9.5 No-Transform Directive.....................................................................................................72
14.9.6 Cache Control Extensions..................................................................................................72
14.10 Connection.............................................................................................................................72
14.11 Content-Encoding..................................................................................................................73
14.12 Content-Language..................................................................................................................73
14.13 Content-Length......................................................................................................................74
14.14 Content-Location ...................................................................................................................74
14.15 Content-MD5.........................................................................................................................75
14.16 Content-Range .......................................................................................................................75
14.17 Content-Type .........................................................................................................................77
14.18 Date........................................................................................................................................77
14.18.1 Clockless Origin Server Operation....................................................................................78
14.19 ETag ......................................................................................................................................78
14.20 Expect....................................................................................................................................78
14.21 Expires...................................................................................................................................78
14.22 From.......................................................................................................................................79
14.23 Host........................................................................................................................................79
14.24 If-Match.................................................................................................................................80
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