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Modify request URL

Source: R/req-url.R
req_url.Rd

  • 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 httr2 request object.

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")
#> <httr2_request>
#> GET http://example.com/a/b/search.html?q=the%20cool%20ice
#> Body: empty

# Change complete url
req |>
  req_url("http://google.com")
#> <httr2_request>
#> GET http://google.com
#> Body: empty

# Use .multi to control what happens with vector parameters:
req |> req_url_query(id = 100:105, .multi = "comma")
#> <httr2_request>
#> GET http://example.com?id=100,101,102,103,104,105
#> Body: empty
req |> req_url_query(id = 100:105, .multi = "explode")
#> <httr2_request>
#> GET http://example.com?id=100&id=101&id=102&id=103&id=104&id=105
#> Body: empty

# If you have query parameters in a list, use !!!
params <- list(a = "1", b = "2")
req |>
  req_url_query(!!!params, c = "3")
#> <httr2_request>
#> GET http://example.com?a=1&b=2&c=3
#> Body: empty