req_url {httr2}

Modify request URL

Description

• req_url() replaces the entire url

• req_url_query() modifies the components of the query

• req_url_path() modifies the path

• req_url_path_append() adds to the path

Usage

req_url(req, url)

req_url_query(.req, ..., .multi = c("error", "comma", "pipe", "explode"))

req_url_path(req, ...)

req_url_path_append(req, ...)

Arguments

req, .req

A request.

url

New URL; completely replaces existing.

...

For req_url_query(): <dynamic-dots> Name-value pairs that define query parameters. Each value must be either an atomic vector or NULL (which removes the corresponding parameters). If you want to opt out of escaping, wrap strings in I().

For req_url_path() and req_url_path_append(): A sequence of path components that will be combined with /.

.multi

Controls what happens when an element of ... is a vector containing multiple values:

• "error", the default, throws an error.

• "comma", separates values with a ⁠,⁠, e.g. ⁠?x=1,2⁠.

• "pipe", separates values with a |, e.g. ?x=1|2.

• "explode", turns each element into its own parameter, e.g. ?x=1&x=2.

If none of these functions work, you can alternatively supply a function that takes a character vector and returns a string.

Value

A modified HTTP request.

Examples

req <- request("http://example.com")

# Change url components
req |>
  req_url_path_append("a") |>
  req_url_path_append("b") |>
  req_url_path_append("search.html") |>
  req_url_query(q = "the cool ice")

# Change complete url
req |>
  req_url("http://google.com")

# Use .multi to control what happens with vector parameters:
req |> req_url_query(id = 100:105, .multi = "comma")
req |> req_url_query(id = 100:105, .multi = "explode")

# If you have query parameters in a list, use !!!
params <- list(a = "1", b = "2")
req |>
  req_url_query(!!!params, c = "3")