10.5.11. /db/_design/design-doc/_rewrite/path — Apache CouchDB 1.6 Documentation

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# 10.5.11. `/db/_design/design-doc/_rewrite/path`

`ANY` `/{db}/_design/{ddoc}/_rewrite/{path}`

  Rewrites the specified path by rules defined in the specified design document.

  The rewrite rules are defined in array field of the design document called `rewrites`. Each rule is an object with next structure:

  - from (string): The path rule used to bind current uri to the rule. It use pattern matching for that
  - to (string): Rule to rewrite an url. It can contain variables depending on binding variables discovered during pattern matching and query args (url args and from the query member)
  - method (string): HTTP request method to bind the request method to the rule. Default is `"*"`
  - query (object): Query args you want to define they can contain dynamic variable by binding the key

  The `to``and ``from` paths may contains string patterns with leading `:` or `*` characters.

  For example: `/somepath/:var/*`

  - This path is converted in Erlang list by splitting `/`
  - Each `var` are converted in atom
  - `""` are converted to `''` atom
  - The pattern matching is done by splitting `/` in request url in a list of token
  - A string pattern will match equal token
  - The star atom (`'*'` in single quotes) will match any number of tokens, but may only be present as the last pathterm in a pathspec
  - If all tokens are matched and all pathterms are used, then the pathspec matches

  The pattern matching is done by first matching the HTTP request method to a rule. `method` is equal to `"*"` by default, and will match any HTTP method. It will then try to match the path to one rule. If no rule matches, then a 404 Not Found response returned.

  Once a rule is found we rewrite the request url using the `to` and `query` fields. The identified token are matched to the rule and will replace var. If `'*'` is found in the rule it will contain the remaining part if it exists.

  Examples:

  Rule | Url | Rewrite to | Tokens
  --- | --- | --- | ---
  {“from”: “/a”, “to”: “/some”} | /a | /some |
  {“from”: “/a/*”, “to”: “/some/*} | /a/b/c | /some/b/c |
  {“from”: “/a/b”, “to”: “/some”} | /a/b?k=v | /some?k=v | k=v
  {“from”: “/a/b”, “to”: “/some/:var”} | /a/b | /some/b?var=b | var=b
  {“from”: “/a/:foo/”, “to”: “/some/:foo/”} | /a/b/c | /some/b/c?foo=b | foo=b
  {“from”: “/a/:foo”, “to”: “/some”, “query”: { “k”: ”:foo” }} | /a/b | /some/?k=b&foo=b | foo=b
  {“from”: “/a”, “to”: “/some/:foo”} | /a?foo=b | /some/?b&foo=b | foo=b

  Request method, header, query parameters, request payload and response body are depended on endpoint to which url will be rewritten.

  Parameters: | db – Database name ddoc – Design document name path – URL path to rewrite

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