ncurl_session {nanonext}R Documentation

ncurl Session

Description

nano cURL - a minimalist http(s) client. A session encapsulates a connection, along with all related parameters, and may be used to return data multiple times by repeatedly calling transact, which transacts once over the connection.

Usage

ncurl_session(
  url,
  convert = TRUE,
  method = NULL,
  headers = NULL,
  data = NULL,
  response = NULL,
  timeout = NULL,
  tls = NULL
)

transact(session)

Arguments

url

the URL address.

convert

[default TRUE] logical value whether to attempt conversion of the received raw bytes to a character vector. Set to FALSE if downloading non-text data.

method

(optional) the HTTP method as a character string. Defaults to 'GET' if not specified, and could also be 'POST', 'PUT' etc.

headers

(optional) a named character vector specifying the HTTP request headers, for example:
c(Authorization = "Bearer APIKEY", `Content-Type` = "text/plain")
A non-character or non-named vector will be ignored.

data

(optional) character string request data to be submitted. If a vector, only the first element is taken, and non-character objects are ignored.

response

(optional) a character vector specifying the response headers to return e.g. c("date", "server"). These are case-insensitive and will return NULL if not present. A non-character vector will be ignored.

timeout

(optional) integer value in milliseconds after which the connection and subsequent transact attempts time out.

tls

(optional) applicable to secure HTTPS sites only, a client TLS Configuration object created by tls_config. If missing or NULL, certificates are not validated.

session

an 'ncurlSession' object.

Value

For ncurl_session: an 'ncurlSession' object if successful, or else an 'errorValue'.

For transact: a named list of 3 elements:

See Also

ncurl_aio for asynchronous http requests.

Examples

s <- ncurl_session("https://postman-echo.com/get",
                   response = "date",
                   timeout = 2000L)
s
if (is_ncurl_session(s)) transact(s)
if (is_ncurl_session(s)) close(s)


[Package nanonext version 1.4.0 Index]