When doing Server side programming, it is acceptable for HTTP calls to be called synchronously.
Therefore the proper pattern is to simply make the first call, receive the result, and then use that in the next line. There is no need to separate the calls into separate threads, or asynchronous calls, unless there is major processing happening between http calls.
For example:
JsonResponseEntry getJsonReportResponse() throws IOException {
String sReportURL = "https://someurl.com/v2/report/report?" +
"startts=" + getDateYesterday("ts") +
"&endts=" + getDateNow("ts") +
"&auth=" + getAuthCode();
URL reportURL = new URL(sReportURL);
URLConnection conn = reportURL.openConnection();
BufferedReader buf = new BufferedReader(new InputStreamReader(conn.getInputStream()));
ObjectMapper mapper = new ObjectMapper();
JsonNode reportResult = mapper.readTree(buf);
return convertJSonNodeToJsonResponseEntry(reportResult);
}
String getAuthCode() throws IOException {
String sReportURL = "https://someurl.com/auth";
URL reportURL = new URL(sReportURL);
HttpURLConnection conn = (HttpURLConnection) reportURL.openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setDoInput(true);
conn.connect();
String urlParameters = "username=myUserName&password=mypassword";
DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();
BufferedReader buf = new BufferedReader(new InputStreamReader(conn.getInputStream()));
ObjectMapper mapper = new ObjectMapper();
AuthResponse response = mapper.readValue(buf, AuthResponse.class);
return response.toString();
}
The function getAuthCode() is synchronously called within the URL call that requires the response.