httr v1.3.0


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Tools for Working with URLs and HTTP

Useful tools for working with HTTP organised by HTTP verbs (GET(), POST(), etc). Configuration functions make it easy to control additional request components (authenticate(), add_headers() and so on).



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The aim of httr is to provide a wrapper for the curl package, customised to the demands of modern web APIs.

Key features:

  • Functions for the most important http verbs: GET(), HEAD(), PATCH(), PUT(), DELETE() and POST().

  • Automatic connection sharing across requests to the same website (by default, curl handles are managed automatically), cookies are maintained across requests, and a up-to-date root-level SSL certificate store is used.

  • Requests return a standard reponse object that captures the http status line, headers and body, along with other useful information.

    • Response content is available with content() as a raw vector (as = "raw"), a character vector (as = "text"), or parsed into an R object (as = "parsed"), currently for html, xml, json, png and jpeg.

    • You can convert http errors into R errors with stop_for_status().

  • Config functions make it easier to modify the request in common ways: set_cookies(), add_headers(), authenticate(), use_proxy(), verbose(), timeout(), content_type(), accept(), progress().

  • Support for OAuth 1.0 and 2.0 with oauth1.0_token() and oauth2.0_token(). The demo directory has eight OAuth demos: four for 1.0 (twitter, vimeo, withings and yahoo) and four for 2.0 (facebook, github, google, linkedin). OAuth credentials are automatically cached within a project.

httr wouldn't be possible without the hard work of the authors of curl and libcurl. Thanks! httr is inspired by http libraries in other languages, such as Resty, Requests and httparty.


To get the current released version from CRAN:


To get the current development version from github:

# install.packages("devtools")

Functions in httr

Name Description
PATCH Send PATCH request to a server.
POST POST file to a server.
Token-class OAuth token objects.
VERB VERB a url.
BROWSE Open specified url in browser.
DELETE Send a DELETE request.
PUT Send PUT request to server.
RETRY Retry a request until it succeeds.
GET GET a url.
HEAD Get url HEADers.
guess_media Guess the media type of a path from its extension.
handle Create a handle tied to a particular host.
http_condition Generate a classed http condition.
http_error Check for an http error.
content Extract content from a request.
content_type Set content-type and accept headers.
headers Extract the headers from a response
hmac_sha1 HMAC SHA1
init_oauth2.0 Retrieve OAuth 2.0 access token.
cookies Access cookies in a response.
get_callback Install or uninstall a callback function
http_status Give information on the status of a request.
http_type Extract the content type of a response
add_headers Add additional headers to a request.
authenticate Use http authentication.
httr-package httr makes http easy.
oauth_app Create an OAuth application.
oauth_callback The oauth callback url.
oauth_endpoint Describe an OAuth endpoint.
oauth_endpoints Popular oauth endpoints.
status_code Extract status code from response.
stop_for_status Take action on http error.
verbose Give verbose output.
with_config Execute code with configuration set.
insensitive Create a vector with case insensitive name matching.
oauth_exchanger Walk the user through the OAuth2 dance without a local webserver.
oauth_listener Create a webserver to listen for OAuth callback.
response The response object.
revoke_all Revoke all OAuth tokens in the cache.
use_proxy Use a proxy to connect to the internet.
user_agent Set user agent.
modify_url Modify a url.
parse_url Parse and build urls according to RFC1808.
progress Add a progress bar.
timeout Set maximum request time.
upload_file Upload a file with POST or PUT.
write_disk Control where the response body is written.
jwt_signature Generate a JWT signature given credentials.
cache_info Compute caching information for a response.
config Set curl options.
handle_pool Maintain a pool of handles.
has_content Does the request have content associated with it?
oauth1.0_token Generate an oauth1.0 token.
write_function S3 object to define response writer.
httr_dr Diagnose common configuration problems
httr_options List available options.
init_oauth1.0 Retrieve OAuth 1.0 access token.
oauth_service_token Generate OAuth token for service accounts.
oauth_signature Generate oauth signature.
set_config Set (and reset) global httr configuration.
oauth2.0_token Generate an oauth2.0 token.
parse_http_date Parse and print http dates.
parse_media Parse a media type.
sha1_hash SHA1 hash
sign_oauth Sign an OAuth request
set_cookies Set cookies.
write_stream Process output in a streaming manner.
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VignetteBuilder knitr
License MIT + file LICENSE
RoxygenNote 6.0.1
NeedsCompilation no
Packaged 2017-08-15 13:16:51 UTC; hadley
Repository CRAN
Date/Publication 2017-08-16 08:54:36 UTC

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