targetUrlIn may be null in high concurrency situations [if token is expired, storageUrl will be empty, and targetUrlIn is null value], targetUrlOut will be a null value too, the func caller will get a invalid http url with error: unsupported protocol scheme.
targetUrlIn may be null in high concurrency situations [if token is expired, storageUrl will be empty, and targetUrlIn is null value], targetUrlOut will be a null value too, the func caller will get a invalid http url with error: unsupported protocol scheme.