HttpURLConnection App Engine Java Example for POST Request does not work
As this question still gets a considerable amount of views 3 years later, I'll confirm here that the method given in the documentation sample works fine for making a POST request to the given URL, and has remained unchanged since this question was first posted. The working code sample is as follows:
String message = URLEncoder.encode("my message", "UTF-8");
URL url = new URL("http://httpbin.org/post");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
writer.write("message=" + message);
writer.close();
StringBuffer responseString = new StringBuffer();
String line;
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
while ((line = reader.readLine()) != null) {
responseString.append(line);
}
reader.close();
The following response was received:
Code: 200, message: { "args": {}, "data": "", "files": {}, "form": {
"message": "my message" }, "headers": { "Accept-Encoding":
"gzip,deflate,br", "Content-Length": "18", "Content-Type":
"application/x-www-form-urlencoded", "Host": "httpbin.org", "User-Agent":
"AppEngine-Google; (+http://code.google.com/appengine; appid: s~
<redacted>)", "X-Cloud-Trace-Context": ",<redacted>" }, "json": null,
"origin": "107.178.194.113", "url": "http://httpbin.org/post"}
Marcio Cabral
Updated on June 04, 2022Comments
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Marcio Cabral almost 2 years
I am trying to do a POST request using urlfetch under an app engine application.
I have followed the instructions (and code) extracted from the simple example found at the App Engine documentation (here https://developers.google.com/appengine/docs/java/urlfetch/usingjavanet), under the section "Using HttpURLConnection".
import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLEncoder; import java.io.BufferedReader; import java.io.InputStreamReader; import java.io.IOException; import java.io.OutputStreamWriter; String message = URLEncoder.encode("my message", "UTF-8"); try { URL url = new URL("http://httpbin.org/post"); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setDoOutput(true); connection.setRequestMethod("POST"); OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream()); writer.write("message=" + message); writer.close(); if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) { // OK } else { // Server returned HTTP error code. } } catch (MalformedURLException e) { // ... } catch (IOException e) { // ... }
In order to test this POST request, I am using the following website "http://httpbin.org/post".
The fetch and connection works - however, the connection is sent as a GET and not as POST.
Here is the response I get from for this request:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <title>405 Method Not Allowed</title> <h1>Method Not Allowed</h1><p>The method GET is not allowed for the requested URL.</p>
Have anybody run into this issue ?
Any help is appreciated.
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JIV over 7 yearsIts doing flush on close. Most streams does.