Extract content from a request.
There are currently three ways to retrieve the contents of a request:
as a raw object (as = "raw"), as a character vector,
(as = "text"), and as parsed into an R object where possible,
(as = "parsed"). If as is not specified, content
does its best to guess which output is most appropriate.
content(x, as = NULL, type = NULL, encoding = NULL, ...)
x |
request object |
as |
desired type of output: |
type |
MIME type (aka internet media type) used to override the content type returned by the server. See http://en.wikipedia.org/wiki/Internet_media_type for a list of common types. |
encoding |
For text, overrides the charset or the Latin1 (ISO-8859-1) default, if you know that the server is returning the incorrect encoding as the charset in the content-type. Use for text and parsed outputs. |
... |
Other parameters parsed on to the parsing functions, if
|
content currently knows about the following mime types:
text/html: xml2::read_html()
text/xml: xml2::read_xml()
text/csv: readr::read_csv()
text/tab-separated-values: readr::read_tsv()
application/json: jsonlite::fromJSON()
application/x-www-form-urlencoded: parse_query
image/jpeg: jpeg::readJPEG()
image/png: png::readPNG()
as = "parsed" is provided as a convenience only: if the type you
are trying to parse is not available, use as = "text" and parse
yourself.
For "raw", a raw vector.
For "text", a character vector of length 1. The character vector is always
re-encoded to UTF-8. If this encoding fails (usually because the page
declares an incorrect encoding), content() will return NA.
For "auto", a parsed R object.
When using content() in a package, DO NOT use on as = "parsed".
Instead, check the mime-type is what you expect, and then parse yourself.
This is safer, as you will fail informatively if the API changes, and
you will protect yourself against changes to httr.
Other response methods:
http_error(),
http_status(),
response(),
stop_for_status()
r <- POST("http://httpbin.org/post", body = list(a = 1, b = 2))
content(r) # automatically parses JSON
cat(content(r, "text"), "\n") # text content
content(r, "raw") # raw bytes from server
rlogo <- content(GET("http://cran.r-project.org/Rlogo.jpg"))
plot(0:1, 0:1, type = "n")
rasterImage(rlogo, 0, 0, 1, 1)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.