w.Header()[xhttp.ETag] = []string{"\"" + objInfo.ETag + "\""}
		}
	}
	// x-amz-copy-source-if-modified-since: Return the object only if it has been modified
	// since the specified time otherwise return 412 (precondition failed).
	ifModifiedSinceHeader := r.Header.Get(xhttp.AmzCopySourceIfModifiedSince)
	if ifModifiedSinceHeader != "" {
		if givenTime, err := amztime.ParseHeader(ifModifiedSinceHeader); err == nil {

```

### Checking cluster health for maintenance

You may query the cluster probe endpoint to check if the node which received the request can be taken down for maintenance, if the server replies back '412 Precondition Failed' this means you will lose HA. '200 OK' means you are okay to proceed.

```
curl http://minio1:9001/minio/health/cluster?maintenance=true
HTTP/1.1 412 Precondition Failed
Accept-Ranges: bytes

	if c.TraceOutput != nil && resp.StatusCode != http.StatusOK {
		c.dumpHTTP(req, resp)
	}

	if resp.StatusCode != http.StatusOK {
		// If server returns 412 pre-condition failed, it would
		// mean that authentication succeeded, but another
		// side-channel check has failed, we shall take
		// the client offline in such situations.

        given:
        internalBuild()
        buildFile << """
            apply plugin: 'elasticsearch.internal-yaml-rest-test'

            dependencies {
               yamlRestTestImplementation "junit:junit:4.12"
            }

            // can't actually spin up test cluster from this test
           tasks.withType(Test).configureEach{ enabled = false }

           tasks.register("printYamlRestTestClasspath").configure {

             id 'elasticsearch.test-base'
            }

            repositories {
                mavenCentral()
            }

            dependencies {
                testImplementation 'junit:junit:4.12'
            }

            tasks.named('test').configure {
                nonInputProperties.systemProperty("foo", project.getProperty('foo'))
            }
        """

        when:

<!-- END MUNGE: GENERATED_TOC -->

<!-- NEW RELEASE NOTES ENTRY -->


# v1.4.12

[Documentation](https://docs.k8s.io) & [Examples](https://releases.k8s.io/release-1.4/examples)

## Downloads for v1.4.12


filename | sha256 hash
-------- | -----------
[kubernetes.tar.gz](https://dl.k8s.io/v1.4.12/kubernetes.tar.gz) | `f0d7ca7e1c92174c900d49087347d043b817eb589803eacc7727a84df9280ed2`

            import org.elasticsearch.gradle.testclusters.TestDistribution;

            dependencies {
               yamlRestTestImplementation "junit:junit:4.12"
            }

            // can't actually spin up test cluster from this test
           tasks.withType(Test).configureEach{ enabled = false }
        """

        String wrongApi = "wrong_version.json"

        props.put("javax.version", "3.1.0");
        props.put("mockito.version", "1.10.19");
        props.put("hamcret.version", "2.1");
        props.put("lombok.version", "1.18.6");
        props.put("junit.version", "4.12");
        Model model = Model.newBuilder(true).properties(props).build();
        String xml = toXml(model);

        for (int i = 0; i < 10; i++) {
            String newStr = toXml(fromXml(xml));

"2.2 OK"
"2.3 OK"
"2.4 OK"
"2.5 OK"
"2.6 OK"
"2.7 OK"
"2.8 OK"
"2.9 OK"
"3.1 OK"
"3.2 NON-STRICT"
"3.3 NON-STRICT"
"3.4 NON-STRICT"
"3.5 OK"
"3.6 OK"
"3.7 OK"
"4.1.1 OK"
"4.1.2 OK"
"4.1.3 NON-STRICT"
"4.1.4 NON-STRICT"
"4.1.5 OK"
"4.2.1 OK"
"4.2.2 OK"
"4.2.3 NON-STRICT"
"4.2.4 OK"
"4.2.5 OK"
"5.1 OK"
"5.10 OK"
"5.11 OK"
"5.12 OK"
"5.13 OK"
"5.14 OK"

requirement of common SLA here original cluster had 1024 drives with 16 drives per erasure set with default parity of '4', second pool is expected to have a minimum of 8 drives per erasure set to match the original cluster SLA (parity count) of '4'. '12' drives stripe per erasure set in the second pool satisfies the original pool's parity count.

Refer to the sizing guide with details on the default parity count chosen for different erasure stripe sizes [here](https://github.com/minio/...