Module Uri

Uniform Resource Identifier handling that is RFC3986-compliant.

type t

A single URI that is a compact sequence of characters that identifies an abstract or physical resource.

type component = [
  1. | `Scheme
  2. | `Authority
  3. | `Userinfo
    (*

    subcomponent of authority in some schemes

    *)
  4. | `Host
    (*

    subcomponent of authority in some schemes

    *)
  5. | `Path
  6. | `Query
  7. | `Query_key
  8. | `Query_value
  9. | `Fragment
  10. | `Generic
  11. | `Custom of component * string * string
]
type pct_encoder

For pct encoding customization when converting a URI to a string.

Core functionality

val empty : t

The empty (zero length) URI reference. Useful for constructing URIs piece-by-piece.

val compare : t -> t -> int

Comparator ordering by host, scheme, port, userinfo, path, query, and finally fragment. Designed to produce a reasonable sort order.

val equal : t -> t -> bool

equal a b is compare a b = 0.

val pct_encode : ?scheme:string -> ?component:component -> string -> string

Percent-encode a string. The component argument defaults to `Path

val pct_encoder : ?scheme:component -> ?userinfo:component -> ?host:component -> ?path:component -> ?query_key:component -> ?query_value:component -> ?fragment:component -> unit -> pct_encoder

Construct a pct_encoder.

val pct_decode : string -> string

Percent-decode a percent-encoded string

val of_string : string -> t

Parse a URI string literal into a URI structure. A bare string will be interpreted as a path; a string prefixed with `//` will be interpreted as a host.

val to_string : ?pct_encoder:pct_encoder -> t -> string

Convert a URI structure into a percent-encoded URI string

val resolve : string -> t -> t -> t

Resolve a URI against a default scheme and base URI

val canonicalize : t -> t

Canonicalize a URI according to Sec 6.2.3 "Scheme-Based Normalization". This transform is more aggressive than the standard URI-generic normalization automatically done. In particular, HTTP(S) URIs with empty path components will have their path components set to "/". Some applications like web servers may rely on the distinction between a path-less and a root-path URI to distinguish request URIs (e.g. OPTIONS * vs OPTIONS /).

val make : ?scheme:string -> ?userinfo:string -> ?host:string -> ?port:int -> ?path:string -> ?query:(string * string list) list -> ?fragment:string -> unit -> t

Make a URI from supplied components. If userinfo or port are supplied without host, an empty host is added. If path is supplied and userinfo, host, or port is also supplied, path is made absolute but not resolved.

val with_uri : ?scheme:string option -> ?userinfo:string option -> ?host:string option -> ?port:int option -> ?path:string option -> ?query:(string * string list) list option -> ?fragment:string option -> t -> t

Functional update for a URI using the supplied components. If a component is unspecified then it will be unchanged. If a component is supplied as None then the component will be removed in the returned URI. If a component is supplied as Some x then x will be added if it does not exist in the source URI or replaced if it does exist.

Query functions

The query string API attempts to accommodate conventional query string representations (i.e. ?key0=value0&key1=value1) while maximally exposing any meaning in those representations. For example, it is not necessarily the case that / and /? are equivalent to a web server. In the former case, we observe a zero query string whereas in the latter case, we observe a query string with a single key, "" and a zero value. Compare this with /?= which has a single key and a single empty value, "". Additionally, some query functions return lists of values for a key. These list values are extracted from a single key with a comma-separated value list. If a query string has multiple identical keys, you must use query to retrieve the entirety of the structured query string.

val query : t -> (string * string list) list

Get a query string from a URI

val verbatim_query : ?pct_encoder:pct_encoder -> t -> string option

Get a verbatim query string from a URI. If the provenance of the URI is a string and its query component has not been updated, this is the literal query string as parsed. Otherwise, this is the composition of query and encoded_of_query

val encoded_of_query : ?scheme:string -> ?pct_encoder:pct_encoder -> (string * string list) list -> string

Make a percent-encoded query string from percent-decoded query tuple

val query_of_encoded : string -> (string * string list) list

Parse a percent-encoded query string into a percent-decoded query tuple

val with_query : t -> (string * string list) list -> t

Replace the query URI with the supplied list. Input URI is not modified

val with_query' : t -> (string * string) list -> t

Replace the query URI with the supplied singleton query list. Input URI is not modified

val get_query_param' : t -> string -> string list option

get_query_param' q key returns the list of values for the key parameter in query q. Note that an empty list is not the same as a None return value. For a query foo, the mapping is:

  • / returns None
  • /?foo returns Some
  • /?foo= returns Some [""]
  • /?foo=bar returns Some ["bar"]
  • /?foo=bar,chi returns Some ["bar","chi"]

Query keys can be duplicated in the URI, in which case the first one is returned. If you want to resolve duplicate keys, obtain the full result set with query instead.

val get_query_param : t -> string -> string option

get_query_param q key returns the value found for a key in query q. If there are multiple values for the key, then the first one is returned.

val add_query_param : t -> (string * string list) -> t

Add a query parameter to the input query URI. Input URI is not modified

val add_query_param' : t -> (string * string) -> t

Add a query parameter to the input singleton query URI. Input URI is not modified

val add_query_params : t -> (string * string list) list -> t

Add a query parameter list to the input query URI. Input URI is not modified

val add_query_params' : t -> (string * string) list -> t

Add a query singleton parameter list to the input query URI. Input URI is not modified

val remove_query_param : t -> string -> t

Remove a query key from the input query URI. Input URI is not modified, and no error is generated if the key does not already exist in the URI.

Component getters and setters

val path : ?pct_encoder:pct_encoder -> t -> string

Get the encoded path component of a URI

val path_and_query : t -> string

Get the encoded path and query components of a URI

val with_path : t -> string -> t

Replace the path URI with the supplied encoded path. If a host is present in the supplied URI, the path is made absolute but not resolved. If the path is empty, the path component is removed. Input URI is not modified

val scheme : t -> string option

Get the scheme component of a URI

val with_scheme : t -> string option -> t

Replace the scheme portion of the URI with the supplied scheme. Input URI is not modified

val userinfo : ?pct_encoder:pct_encoder -> t -> string option

Get the userinfo component of a URI

val with_userinfo : t -> string option -> t

Replace the userinfo portion of the URI with the supplied string option. If no host is present in the supplied URI, an empty host is added. Input URI is not modified.

val user : t -> string option

Get the username component of a URI

val password : t -> string option

Get the password component of a URI

val with_password : t -> string option -> t

Replace the password portion of the URI with the supplied string option. If no host is present in the supplied URI, an empty host is added. Input URI is not modified.

val host : t -> string option

Get the host component of a URI

val with_host : t -> string option -> t

Replace the host component of the URI. Input URI is not modified.

val host_with_default : ?default:string -> t -> string

Get the host component of a URI, with a default supplied if one is not present

val port : t -> int option

Get the port component of a URI

val with_port : t -> int option -> t

Replace the port component of the URI with the supplied port. If no host is present in the supplied URI, an empty host is added. Input URI is not modified.

val fragment : t -> string option

Get the fragment component of a URI

val with_fragment : t -> string option -> t

Replace the fragment component of a URI with the supplied fragment. Input URI is not modified

Formatters

val pp : Stdlib.Format.formatter -> t -> unit

pp ppf t will output a human readable version of the Uri t to the formatter ppf

val pp_hum : Stdlib.Format.formatter -> t -> unit

pp_hum is now an alias for the pp function.

module Parser : sig ... end
module Absolute_http : sig ... end

Specializations for HTTP and HTTPS schemes as per RFC9110