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Update the guide with range requests support
Also update the list of headers cowboy_rest might set and tweak a small number of other items.
This commit is contained in:
Loïc Hoguin
parent
4ffcbfbf43
commit
427a276ef2
8 changed files with 1350 additions and 325 deletions
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@ -144,6 +144,16 @@ never be called.
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Implement the `languages_provided` or `charsets_provided`
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callbacks if applicable.
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Does the resource accept ranged requests? If it does,
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implement the `ranges_provided` callback. Resources that
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only accept `bytes` units can use the callback name
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`auto` and let Cowboy automatically do ranged responses.
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Other callbacks should have a name prefix of `ranged_`
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for clarity. For example, `ranged_bytes` or `ranged_pages`.
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If the resource needs to perform additional checks before
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accepting to do a ranged responses, implement the
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`range_satisfiable` callback.
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Is there any other header that may make the representation
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of the resource vary? Implement the `variances` callback.
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@ -191,10 +201,15 @@ the `options` method.
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=== GET and HEAD methods
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If you implement the methods GET and/or HEAD, you must
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implement one `ProvideResource` callback for each
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implement one `ProvideCallback` callback for each
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content-type returned by the `content_types_provided`
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callback.
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When range requests are accepted, you must implement one
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`RangeCallback` for each range unit returned by
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`ranges_provided` (unless `auto` was used). This is
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in addition to the `ProvideCallback` callback.
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=== PUT, POST and PATCH methods
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If you implement the methods PUT, POST and/or PATCH,
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|
|
@ -95,6 +95,11 @@ callback will only be called at the end of the
|
|||
"GET and HEAD methods" diagram, when all conditions
|
||||
have been met.
|
||||
|
||||
Optionally, the `ranges_provided` also returns the
|
||||
name of a callback for every range unit it accepts. This
|
||||
will be called at the end of the "GET and HEAD methods"
|
||||
diagram in the case of ranged requests.
|
||||
|
||||
The selected content-type, language and charset are
|
||||
saved as meta values in the Req object. You *should*
|
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use the appropriate representation if you set a
|
||||
|
|
@ -121,11 +126,18 @@ succeed, the resource can be retrieved.
|
|||
|
||||
Cowboy prepares the response by first retrieving
|
||||
metadata about the representation, then by calling
|
||||
the `ProvideResource` callback. This is the callback
|
||||
the `ProvideCallback` callback. This is the callback
|
||||
you defined for each content-types you returned from
|
||||
`content_types_provided`. This callback returns the body
|
||||
that will be sent back to the client, or a fun if the
|
||||
body must be streamed.
|
||||
that will be sent back to the client.
|
||||
|
||||
For ranged requests, but only when the `ranges_provided`
|
||||
callback was defined earlier, Cowboy will add the selected
|
||||
`range` information to the Req object and call the
|
||||
`range_satisfiable` callback. After confirming that the
|
||||
range can be provided, Cowboy calls the `RangeResource`
|
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callback and produces a ranged response using the
|
||||
ranged data from the callback.
|
||||
|
||||
When the resource does not exist, Cowboy will figure out
|
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whether the resource existed previously, and if so whether
|
||||
|
|
|
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Binary file not shown.
|
Before Width: | Height: | Size: 92 KiB After Width: | Height: | Size: 168 KiB |
File diff suppressed because it is too large
Load diff
|
Before Width: | Height: | Size: 71 KiB After Width: | Height: | Size: 115 KiB |
|
|
@ -84,6 +84,8 @@ if it is undefined, moving directly to the next step. Similarly,
|
|||
| multiple_choices | `false`
|
||||
| options | `ok`
|
||||
| previously_existed | `false`
|
||||
| ranges_provided | skip
|
||||
| range_satisfiable | `true`
|
||||
| rate_limited | `false`
|
||||
| resource_exists | `true`
|
||||
| service_available | `true`
|
||||
|
|
@ -97,8 +99,9 @@ As you can see, Cowboy tries to move on with the request whenever
|
|||
possible by using well thought out default values.
|
||||
|
||||
In addition to these, there can be any number of user-defined
|
||||
callbacks that are specified through `content_types_accepted/2`
|
||||
and `content_types_provided/2`. They can take any name, however
|
||||
callbacks that are specified through `content_types_accepted/2`,
|
||||
`content_types_provided/2` or `ranges_provided/2`. They can take
|
||||
any name (except `auto` for range callbacks), however
|
||||
it is recommended to use a separate prefix for the callbacks of
|
||||
each function. For example, `from_html` and `to_html` indicate
|
||||
in the first case that we're accepting a resource given as HTML,
|
||||
|
|
@ -113,9 +116,10 @@ Req object directly. The values are defined in the following table:
|
|||
[cols="<,<",options="header"]
|
||||
|===
|
||||
| Key | Details
|
||||
| media_type | The content-type negotiated for the response entity.
|
||||
| language | The language negotiated for the response entity.
|
||||
| charset | The charset negotiated for the response entity.
|
||||
| media_type | The content-type negotiated for the response entity
|
||||
| language | The language negotiated for the response entity
|
||||
| charset | The charset negotiated for the response entity
|
||||
| range | The range selected for the ranged response
|
||||
|===
|
||||
|
||||
They can be used to send a proper body with the response to a
|
||||
|
|
@ -129,11 +133,16 @@ of the REST code. They are listed in the following table.
|
|||
[cols="<,<",options="header"]
|
||||
|===
|
||||
| Header name | Details
|
||||
| accept-ranges | Range units accepted by the resource
|
||||
| allow | HTTP methods allowed by the resource
|
||||
| content-language | Language used in the response body
|
||||
| content-range | Range of the content found in the response
|
||||
| content-type | Media type and charset of the response body
|
||||
| etag | Etag of the resource
|
||||
| expires | Expiration date of the resource
|
||||
| last-modified | Last modification date for the resource
|
||||
| location | Relative or absolute URI to the requested resource
|
||||
| retry-after | Delay or time the client should wait before accessing the resource
|
||||
| vary | List of headers that may change the representation of the resource
|
||||
| www-authenticate | Authentication information to access the resource
|
||||
|===
|
||||
|
|
|
|||
|
|
@ -1196,6 +1196,7 @@ if_range(Req=#{headers := #{<<"if-range">> := _, <<"range">> := _}},
|
|||
if_range(Req, State) ->
|
||||
range(Req, State).
|
||||
|
||||
%% @todo This can probably be moved to if_range directly.
|
||||
range(Req, State=#state{ranges_a=[]}) ->
|
||||
set_resp_body(Req, State);
|
||||
range(Req, State) ->
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue