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std/net ​

Package url parses URLs and implements query escaping.

See RFC 3986. This package generally follows RFC 3986, except where it deviates for compatibility reasons.

Index ​

fn QueryUnescape(s: string)!: string
fn PathUnescape(s: string)!: string
fn QueryEscape(s: string): string
fn PathEscape(s: string): string
fn User(username: string): &UserInfo
fn UserPassword(username: string, password: string): &UserInfo
fn Parse(rawURL: string)!: &URL
fn ParseRequestURI(rawURL: string)!: &URL
fn ParseQuery(query: string)!: Values
fn JoinPath(base: string, elem: ...string)!: string
struct Error
    fn String(*self): string
type EscapeError
    fn String(*self): string
type InvalidHostError
    fn String(*self): string
struct UserInfo
    fn Username(*self): string
    fn Password(*self): (string, bool)
    fn String(*self): string
struct URL
    fn EscapedPath(*self): string
    fn EscapedFragment(*self): string
    fn IsAbs(*self): bool
    fn ResolveReference(mut *self, mut ref: &URL): &URL
    fn Parse(mut *self, ref: string)!: &URL
    fn Query(*self)!: Values
    fn RequestURI(*self): string
    fn Hostname(*self): string
    fn Port(*self): string
    fn JoinPath(mut *self, elem: ...string): &URL
    fn String(*self): string
    fn Redacted(*self): string
type Values
    fn Get(*self, key: string): string
    fn Set(mut *self, key: string, value: string)
    fn Add(mut *self, key: string, value: string)
    fn Del(mut *self, key: string)
    fn Has(*self, key: string): bool
    fn Encode(*self): string

QueryUnescape ​

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fn QueryUnescape(s: string)!: string

Does the inverse transformation of [QueryEscape], converting each 3-byte encoded substring of the form "%AB" into the hex-decoded byte 0xAB. It returns an error if any % is not followed by two hexadecimal digits.

PathUnescape ​

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fn PathUnescape(s: string)!: string

Does the inverse transformation of [PathEscape], converting each 3-byte encoded substring of the form "%AB" into the hex-decoded byte 0xAB. It returns an error if any % is not followed by two hexadecimal digits.

It is identical to [QueryUnescape] except that it does not unescape '+' to ' ' (space).

QueryEscape ​

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fn QueryEscape(s: string): string

Escapes the string so it can be safely placed inside a [URL] query.

PathEscape ​

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fn PathEscape(s: string): string

Escapes the string so it can be safely placed inside a [URL] path segment, replacing special characters (including /) with %XX sequences as needed.

User ​

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fn User(username: string): &UserInfo

Returns a [UserInfo] containing the provided username and no password set.

UserPassword ​

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fn UserPassword(username: string, password: string): &UserInfo

Returns a [UserInfo] containing the provided username and password.

This functionality should only be used with legacy web sites. RFC 2396 warns that interpreting Userinfo this way “is NOT RECOMMENDED, because the passing of authentication information in clear text (such as URI) has proven to be a security risk in almost every case where it has been used.”

Parse ​

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fn Parse(rawURL: string)!: &URL

Parses a raw url into a [URL] structure.

The url may be relative (a path, without a host) or absolute (starting with a scheme). Trying to parse a hostname and path without a scheme is invalid but may not necessarily return an error, due to parsing ambiguities.

ParseRequestURI ​

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fn ParseRequestURI(rawURL: string)!: &URL

Parses a raw url into a [URL] structure. It assumes that url was received in an HTTP request, so the url is interpreted only as an absolute URI or an absolute path. The string url is assumed not to have a #fragment suffix. (Web browsers strip #fragment before sending the URL to a web server.)

ParseQuery ​

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fn ParseQuery(query: string)!: Values

Parses the URL-encoded query string and returns a map listing the values specified for each key. It always returns a non-nil map containing all the valid query parameters found; err describes the first decoding error encountered, if any.

Query is expected to be a list of key=value settings separated by ampersands. A setting without an equals sign is interpreted as a key set to an empty value. Settings containing a non-URL-encoded semicolon are considered invalid.

JoinPath ​

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fn JoinPath(base: string, elem: ...string)!: string

Returns a [URL] string with the provided path elements joined to the existing path of base and the resulting path cleaned of any ./ or ../ elements.

Error ​

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struct Error {
	Op:  string
	URL: string
	Err: any
}

Reports an error and the operation and URL that caused it.

String ​

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fn String(*self): string

EscapeError ​

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type EscapeError: string

String ​

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fn String(*self): string

InvalidHostError ​

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type InvalidHostError: string

String ​

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fn String(*self): string

UserInfo ​

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struct UserInfo {
	// NOTE: contains filtered hidden or unexported fields
}

Immutable encapsulation of username and password details for a [URL]. An existing Userinfo value is guaranteed to have a username set (potentially empty, as allowed by RFC 2396), and optionally a password.

Username ​

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fn Username(*self): string

Returns the username.

Password ​

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fn Password(*self): (string, bool)

Returns the password in case it is set, and whether it is set.

String ​

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fn String(*self): string

Returns the encoded userinfo information in the standard form of "username[:password]".

URL ​

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struct URL {
	Scheme:      string
	Opaque:      string    // encoded opaque data
	User:        &UserInfo // username and password information
	Host:        string    // host or host:port (see Hostname and Port methods)
	Path:        string    // path (relative paths may omit leading slash)
	RawPath:     string    // encoded path hint (see EscapedPath method)
	OmitHost:    bool      // do not emit empty host (authority)
	ForceQuery:  bool      // append a query ('?') even if RawQuery is empty
	RawQuery:    string    // encoded query values, without '?'
	Fragment:    string    // fragment for references, without '#'
	RawFragment: string    // encoded fragment hint (see EscapedFragment method)
}

A URL represents a parsed URL (technically, a URI reference).

The general form represented is:

[scheme:][//[userinfo@]host][/]path[?query][#fragment]

URLs that do not start with a slash after the scheme are interpreted as:

scheme:opaque[?query][#fragment]

The Host field contains the host and port subcomponents of the URL. When the port is present, it is separated from the host with a colon. When the host is an IPv6 address, it must be enclosed in square brackets: "[fe80::1]:80". The [net::JoinHostPort] function combines a host and port into a string suitable for the Host field, adding square brackets to the host when necessary.

Note that the Path field is stored in decoded form: /%47%6f%2f becomes /Go/. A consequence is that it is impossible to tell which slashes in the Path were slashes in the raw URL and which were %2f. This distinction is rarely important, but when it is, the code should use the [URL.EscapedPath] method, which preserves the original encoding of Path.

The RawPath field is an optional field which is only set when the default encoding of Path is different from the escaped path. See the EscapedPath method for more details.

URL's String method uses the EscapedPath method to obtain the path.

EscapedPath ​

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fn EscapedPath(*self): string

Returns the escaped form of self.Path. In general there are multiple possible escaped forms of any path. It returns self.RawPath when it is a valid escaping of self.Path. Otherwise it ignores self.RawPath and computes an escaped form on its own. The [URL.String] and [URL.RequestURI] methods use EscapedPath to construct their results. In general, code should call EscapedPath instead of reading self.RawPath directly.

EscapedFragment ​

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fn EscapedFragment(*self): string

Returns the escaped form of self.Fragment. In general there are multiple possible escaped forms of any fragment. It returns self.RawFragment when it is a valid escaping of self.Fragment. Otherwise it ignores self.RawFragment and computes an escaped form on its own. The [URL.String] method uses EscapedFragment to construct its result. In general, code should call EscapedFragment instead of reading self.RawFragment directly.

IsAbs ​

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fn IsAbs(*self): bool

Reports whether the [URL] is absolute. Absolute means that it has a non-empty scheme.

ResolveReference ​

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fn ResolveReference(mut *self, mut ref: &URL): &URL

Resolves a URI reference to an absolute URI from an absolute base URI self, per RFC 3986 Section 5.2. The URI reference may be relative or absolute. It always returns a new [URL] instance, even if the returned URL is identical to either the base or reference. If ref is an absolute URL, then it ignores base and returns a copy of ref.

Parse ​

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fn Parse(mut *self, ref: string)!: &URL

Parses a [URL] in the context of the receiver. The provided URL may be relative or absolute. It returns nil, error on parse failure, otherwise its return value is the same as [URL.ResolveReference].

Query ​

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fn Query(*self)!: Values

Parses RawQuery and returns the corresponding values.

RequestURI ​

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fn RequestURI(*self): string

Returns the encoded path?query or opaque?query string that would be used in an HTTP request for self.

Hostname ​

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fn Hostname(*self): string

Returns self.Host, stripping any valid port number if present.

If the result is enclosed in square brackets, as literal IPv6 addresses are, the square brackets are removed from the result.

Port ​

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fn Port(*self): string

Returns the port part of self.Host, without the leading colon.

If self.Host doesn't contain a valid numeric port, returns an empty string.

JoinPath ​

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fn JoinPath(mut *self, elem: ...string): &URL

Returns a new [URL] with the provided path elements joined to any existing path and the resulting path cleaned of any ./ or ../ elements. Any sequences of multiple / characters will be reduced to a single /.

String ​

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fn String(*self): string

Reassembles the [URL] into a valid URL string. The general form of the result is one of:

scheme:opaque?query#fragment
scheme://userinfo@host/path?query#fragment

If self.Opaque is non-empty, it uses the first form; otherwise it uses the second form. Any non-ASCII characters in host are escaped. To obtain the path, it uses self.EscapedPath().

In the second form, the following rules apply:

  • if self.Scheme is empty, scheme: is omitted.
  • if self.User is nil, userinfo@ is omitted.
  • if self.Host is empty, host/ is omitted.
  • if self.Scheme and self.Host are empty and self.User is nil, the entire scheme://userinfo@host/ is omitted.
  • if self.Host is non-empty and self.Path begins with a /, the form host/path does not add its own /.
  • if self.RawQuery is empty, ?query is omitted.
  • if self.Fragment is empty, #fragment is omitted.

Redacted ​

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fn Redacted(*self): string

Like [URL.String] but replaces any password with "xxxxx". Only the password in self.User is redacted.

Values ​

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type Values: map[string][]string

Maps a string key to a list of values. It is typically used for query parameters and form values. The keys in a Values map are case-sensitive.

Get ​

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fn Get(*self, key: string): string

Gets the first value associated with the given key. If there are no values associated with the key, returns the empty string. To access multiple values, use the map directly.

Set ​

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fn Set(mut *self, key: string, value: string)

Sets the key to value. It replaces any existing values.

Add ​

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fn Add(mut *self, key: string, value: string)

Adds the value to key. It appends to any existing values associated with key.

Del ​

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fn Del(mut *self, key: string)

Deletes the values associated with key.

Has ​

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fn Has(*self, key: string): bool

Reports whether a given key is set.

Encode ​

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fn Encode(*self): string

Encodes the values into “URL encoded” form ("bar=baz&foo=quux") sorted by key.