You’re probably asking yourself: How can I enable Compression support in JMeter?
JMeter can use up to 10x more bandwidth when compression is disabled.
Learn how to configure JMeter to support Request and Response Compression like GZip.
As explained on HTTP Compression, the client advertises itself as capable of handling various compression formats:
GET /encrypted-area HTTP/1.1 Host: www.example.com Accept-Encoding: gzip, deflate
The server should then respond with the
Content-Encoding: gzip header:
HTTP/1.1 200 OK Server: Apache/126.96.36.199 (Unix) (Red-Hat/Linux) Accept-Ranges: bytes Content-Length: 438 Connection: close Content-Type: text/html; charset=UTF-8 Content-Encoding: gzip
Let’s see how we can enable HTTP compression in JMeter with minimal fuss.
Accept Gzipped Responses
Add the following HTTP Header:
- Header Name:
- Header Value:
View the Results TreeListener to the test plan,
- Run your test plan,
- View the
Sampler resulttab for one of the http request.
You should see the same as above, the server should be responding with a gzipped response. Another way to verify is in the
Summary Report stats:
Avg Bytesshows the uncompressed size,
KB/secshows the compressed downloaded size, which should be 6x-10x smaller than uncompressed.
JMeter will automatically uncompress gzipped responses and show uncompressed response data.
Send Gzipped Requests
The previous solution shows how to enable the server to send Gzipped responses. But, it can also be enabled on the client side, to send gzipped request. The following http headers show a sample gzipped http request:
POST /api/test HTTP/1.1 Content-Type: application/json Transfer-Encoding: chunked Content-Encoding: gzip Connection: Keep-Alive User-Agent: Apache-HttpClient/UNAVAILABLE (java 1.5) Accept-Encoding: gzip,deflate
The following procedure explains how to send Gzipped Post Requests using JMeter.
- Add an HTTP Header Manager with the following headers:
Content-Type: application/json Content-Encoding: gzip
- Add JSR223 PreProcessor as a child of the request which needs to be encoded, and define the following script:
import org.apache.commons.io.IOUtils; import java.util.zip.GZIPOutputStream; String bodyString = sampler.getArguments().getArgument(0).getValue(); byte  requestBody = bodyString.getBytes(); ByteArrayOutputStream out = new ByteArrayOutputStream(requestBody.length); GZIPOutputStream gzip = new GZIPOutputStream(out); gzip.write(requestBody); gzip.close(); sampler.getArguments().getArgument(0).setValue(out.toString(0));
This scripts replaces the body content by gzipping it.