Okay, nice list of headers to set.
Who sets what?
What is already answered by you.
Who:
1) ServletEngine
2) Cocoon
2.1) CocoonReader
2.2) CocoonSerializer
2.3) CocoonGenerators
I think that the ServletEngine won't set any headers, will reread the
servlet-spec...
I have not dived into Cocoon to understand 100% contracts for
serializer, and generators, and
if they are allowed to set the http-headers.
But probably it's not the task of the serializer to set the http-headers.
Thus the http-headers should be set be Cocoon-Servlet after the request
is handled.
Is this right?
I will take a look at Cocoon-1 implementation.
Berin Loritsch wrote:
> Bernhard Huber wrote:
>
>> Perhaps setting always a LastModifiedHeader will help too.
>
>
> This is one thing that Cocoon may want to include no matter what.
> Here are the list of
> valid HTTP 1.1 Headers for responses:
>
> Accept-Ranges
> Age
> ETag
> Location
> Proxy-Authenticate
> Retry-After
> Server
> Vary
> WWW-Authenticate
>
> Brief overview for those who don't know:
>
> Accept-Ranges: {bytes|none}
> Allows the server to indicate it's acceptance of range requests for a
> resource. Probably
> not something we want to support at this time, so Cocoon should set
> this header to none
> all the time.
>
> Age: {seconds}
> Allows the server to convey the number of seconds since the response
> (or revalidation)
> was generated by the origin server. This is used for cache-generated
> responses. In
> essence, the Caching mechanism must set this header.
>
> ETag: {xyzzy|W/xyzzy|}
> This has to do with Entity Tags, which I don't fully understand. If a
> developer understands
> it and can use it, then they can implement it.
>
> Location: {absoluteURI}
> This is the redirect header--handled by the Redirector in Cocoon.
>
> Proxy-Authenticate: {challenge}
> this is used in conjunction with a 407 Proxy Authentication Required
> response.
>
> Retry-After: {HTTP date|seconds}
> This is used in conjunction with a 503 service unavailable response.
> We can use this when
> we are compiling the initial sitemap and we receive requests.
>
> Server: {product|comment}
> This is usually used by the official web server, and it might be
> augmented to advertise
> Cocoon....
>
> Vary: {*|field-name}
> The server should include this header with any cacheable responce that
> is subject to
> server driven negotiation. Basically, it tells the client that the
> resource will only
> vary on the list of field names in a POST message.
>
> WWW-Authenticate: {challenge}
> This MUST be included with the 401 Unauthorized message--usually taken
> care of by the
> servlet container.
>
>
> Beyond this, we have the Entity Header fields. These are used for
> BOTH requests and response
> messages. These are:
>
> Allow
> Content-Encoding
> Content-Language
> Content-Length
> Content-Location
> Content-MD5
> Content-Range
> Content-Type
> Expires
> Last-Modified
>
> Again, the quick definitions of these headers are:
>
> Allow: {GET|HEAD|PUT|http method type}
> Used to specify the types of methods allowable for a resource. Must
> be present with
> the 405 Method Not Allowed response. This is useful for forcing POST
> instead of GET
> methods for forms, etc. Again, not something Cocoon needs to do out
> of the gate.
>
> Content-Encoding: {content coding}
> Used when additional encoding has been performed (like gzip) on the
> resource. After
> applying the proper decoding, the resource is the same as identified
> by the Content-Type
> message.
>
> Content-Language: {2 char language code}
> Used to specify if the resource is specific to a locale. If this is
> omitted, the content
> is intended for all languages. This can be a comma separated list.
> Remember, this can
> be both request/response. We can use this clue if we want to do
> internationalization
> based on the HTTP header.
>
> Content-MD5: {base64 encoding of 128 bit MD5 digest}
> If the content is static, this could be useful to ensure the received
> document is valid
> and has not been corrupted in transit.
>
> Content-Range: {byte unit}
> {first-byte-pos}-{last-byte-pos}/{instance-length|*}
> Used for only downloading a range of bytes (useful for reducing
> traffic on the net).
>
> Content-Type: {mime-type}
> We all know this one. Cocoon SHOULD set this _allways_.
>
> Expires: {http date}
> Specifies when a resource expires (absolute date). Used to help proxy
> and client cache
> implementations. For resources that do not cache, it should be set to
> the same value as
> the Date header.
>
> Last-Modified: {http date}
> Specifies the absolute date/time when the resource was last changed.
> Used to help proxy
> and client cache implementaitons. This should be set by the Cache
> mechanism.
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