Many APIs document their methods with a lightweight template mechanism
that looks like GET /user/{user} or POST /organisation/:org. This
function makes it easy to copy and paste such snippets and retrieve template
variables either from function arguments or the current environment.
req_template() will append to the existing path so that you can set a
base url in the initial request(). This means that you'll generally want
to avoid multiple req_template() calls on the same request.
Usage
req_template(req, template, ..., .env = parent.frame())Arguments
- req
A httr2 request object.
- template
A template string which consists of a optional HTTP method and a path containing variables labelled like either
:fooor{foo}.- ...
Template variables.
- .env
Environment in which to look for template variables not found in
.... Expert use only.
Value
A modified HTTP request.
Examples
httpbin <- request(example_url())
# You can supply template parameters in `...`
httpbin |> req_template("GET /bytes/{n}", n = 100)
#> <httr2_request>
#> GET http://127.0.0.1:45725/bytes/100
#> Body: empty
# or you retrieve from the current environment
n <- 200
httpbin |> req_template("GET /bytes/{n}")
#> <httr2_request>
#> GET http://127.0.0.1:45725/bytes/200
#> Body: empty
# Existing path is preserved:
httpbin_test <- request(example_url()) |> req_url_path("/test")
name <- "id"
value <- "a3fWa"
httpbin_test |> req_template("GET /set/{name}/{value}")
#> <httr2_request>
#> GET http://127.0.0.1:45725/test/set/id/a3fWa
#> Body: empty