Investigate readSDMX with https SDMX web-resources

[eblondel]

There is an issue with applying readSDMX on https SDMX web-resources.
Example from ECB:

dataURL <- "https://sdw-wsrest.ecb.europa.eu/service/data/DD/M.SE.BSI_STF.RO.4F_N"
sdmx <- readSDMX(dataURL)

with the following error:

<SSL_CACERT in function (type, msg, asError = TRUE) { if (!is.character(type)) { i = match(type, CURLcodeValues) typeName = if (is.na(i)) character() else names(CURLcodeValues)[i] } typeName = gsub("^CURLE_", "", typeName) fun = (if (asError) stop else warning) fun(structure(list(message = msg, call = sys.call()), class = c(typeName, "GenericCurlError", "error", "condition")))}(60L, "SSL certificate problem, verify that the CA cert is OK. Details:\nerror:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed", TRUE): SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed>