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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 request.

template

A template string which consists of a optional HTTP method and a path containing variables labelled like either :foo or {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("http://httpbin.org")

# You can supply template parameters in `...`
httpbin %>% req_template("GET /bytes/{n}", n = 100)
#> <httr2_request>
#> GET http://httpbin.org/bytes/100
#> Body: empty

# or you retrieve from the current environment
n <- 200
httpbin %>% req_template("GET /bytes/{n}")
#> <httr2_request>
#> GET http://httpbin.org/bytes/200
#> Body: empty

# Existing path is preserved:
httpbin_cookies <- request("http://httpbin.org/cookies")
name <- "id"
value <- "a3fWa"
httpbin_cookies %>% req_template("GET /set/{name}/{value}")
#> <httr2_request>
#> GET http://httpbin.org/cookies/set/id/a3fWa
#> Body: empty