diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/manual/cowboy_rest.asciidoc | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/doc/src/manual/cowboy_rest.asciidoc b/doc/src/manual/cowboy_rest.asciidoc index 0bb6d47..ea6dba9 100644 --- a/doc/src/manual/cowboy_rest.asciidoc +++ b/doc/src/manual/cowboy_rest.asciidoc @@ -379,7 +379,7 @@ and that the request shouldn't be repeated. ---- generate_etag(Req, State) -> {Result, Req, State} -Result :: binary() | {weak | strong, binary()} +Result :: binary() | {weak | strong, binary()} | undefined Default - no etag value ---- @@ -389,6 +389,10 @@ When a binary is returned, the value is automatically parsed to a tuple. The binary must be in the same format as the etag header, including quotes. +It is possible to conditionally generate an etag. +When no etag can be generated, `undefined` should +be returned. + === is_authorized [source,erlang] @@ -730,6 +734,9 @@ listed here, like the authorization header. == Changelog +* *2.11*: The `generate_etag` callback can now return + `undefined` to conditionally avoid generating + an etag. * *2.9*: An `AcceptCallback` can now return `{created, URI}` or `{see_other, URI}`. The return value `{true, URI}` is deprecated. |