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#' Download Data using an ERDDAP URL
#' @keywords internal
#' \code{getErddapURL} is an internal function makes the URL request to ERDDAP
#'
#' @param myURL A character string containing the full ERDDAP URL
#' @param destfile A character string with the name of the file to store the
#' returned data, a netcdf file
#' @return downloadReturn returns 0 is successful, -1 otherwise
#'
getErddapURL <- function(myURL, destfile, verbose=FALSE) {
numtries <- 10
tryn <- 1
requestStatus <- 0
while (tryn < numtries & requestStatus != 200) {
if (verbose) {
myHTTP <- httr::GET(myURL, httr::verbose(), httr::progress(), httr::write_disk(destfile, overwrite = TRUE))
} else {
myHTTP <- httr::GET(myURL, httr::write_disk(destfile, overwrite = TRUE))
}
requestStatus <- httr::status_code(myHTTP)
if (requestStatus == 200) {
# binContent <- httr::content(myHTTP, "raw")
# writeBin(binContent, destfile)
downloadReturn <- 0
break
} else if ((requestStatus == 500) | (requestStatus == 404)) {
print(paste0("Error trying to retrive file, status", requestStatus))
print("Header Info of URL Request")
httr::headers(myHTTP)
downloadReturn <- -1
break
} else {
print(paste0("Download Attempt: ", tryn))
print(paste0("Error trying to retrive file, status", requestStatus))
print("Header Info of URL Request")
httr::headers(myHTTP)
print("Will pause and try again")
Sys.sleep(5)
tryn <- tryn + 1
}
} #while
return(downloadReturn)
} #function
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