showEnvironmentVariables {CGIwithR} | R Documentation |
These two functions provide facilities for adding information to the
output about the
request and the environment variables for the call.
writeRequestInfo
displays information about this
package (name and version) and the query string for the
query/request.
showEnvironmentVariables(env = Sys.getenv()) writeRequestInfo(env = c("PATH_INFO", "HTTP_HOST", "HTTP_USER_AGENT", "HTTP_REFERER", "REMOTE_ADDR"), size = -1)
env |
either a character vector with names which are assumed to
be the evironment variable name - value pairs,
or alternatively, a character vector of environment variable
names which are then queried to find the current values.
For writeRequestInfo , to turn off the output of the
environment variables, specify a value of FALSE .
|
size |
an integer value which is used as the value for the attribute size in the HTML element font to specify how large the text should be for the content in this section. |
Both functions return the value of
env
, after any expansion to compute the
values of the environment variables.
In the case of writeRequestInfo
, if env
is
FALSE
, this is the value returned.
Duncan Temple Lang <duncan@wald.ucdavis.edu>
# The default behaviour writeRequestInfo() # Show only FORM_DATA writeRequestInfo("FORM_DATA") # named character vector of variable name=value pairs writeRequestInfo(c("myValue" = "foo")) # Don't show any environment variables. writeRequestInfo(character(0))