[FLINK-5646] [docs] Document JAR upload with the REST API

This closes #3722

Project: http://git-wip-us.apache.org/repos/asf/flink/repo
Commit: http://git-wip-us.apache.org/repos/asf/flink/commit/97ca03a0
Tree: http://git-wip-us.apache.org/repos/asf/flink/tree/97ca03a0
Diff: http://git-wip-us.apache.org/repos/asf/flink/diff/97ca03a0

Branch: refs/heads/master
Commit: 97ca03a0dc7f9444d40ea884bfb1e0305d6703e2
Parents: 0391e41
Author: hamstah <hamstahg...@gmail.com>
Authored: Sat Apr 15 15:34:14 2017 +0100
Committer: Stephan Ewen <se...@apache.org>
Committed: Thu Apr 20 10:52:37 2017 +0200

 docs/monitoring/rest_api.md | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/docs/monitoring/rest_api.md b/docs/monitoring/rest_api.md
index a53067d..c5efcc2 100644
--- a/docs/monitoring/rest_api.md
+++ b/docs/monitoring/rest_api.md
@@ -660,6 +660,19 @@ The `savepointPath` points to the external path of the 
savepoint, which can be u
 It is possible to upload, run, and list Flink programs via the REST APIs and 
web frontend.
+#### Upload a new JAR file
+Send a `POST` request to `/jars/upload` with your jar file sent as multi-part 
data under the `jarfile` file.
+Also make sure that the multi-part data includes the `Content-Type` of the 
file itself, some http libraries do not add the header by default.
+The multi-part payload should start like
+Content-Disposition: form-data; name="jarfile"; filename="YourFileName.jar"
+Content-Type: application/x-java-archive
 #### Run a Program (POST)
 Send a `POST` request to `/jars/:jarid/run`. The `jarid` parameter is the file 
name of the program JAR in the configured web frontend upload directory 
(configuration key `jobmanager.web.upload.dir`).

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