}
      }
    ```

### Posting a File ([.kt][PostFileKotlin], [.java][PostFileJava])

It's easy to use a file as a request body.

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient()

      fun run() {
        val file = File("README.md")

        val request = Request.Builder()

            try {
                return OptionalEntity.of(userInfoCache.get(userCode));
            } catch (final ExecutionException e) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Failed to access UserInfo cache.", e);
                }
            }
        }
        return OptionalEntity.empty();
    }

    /**
     * Processes the search log queue.
     *

                        set.add(e);
                    }
                }
            } catch (final IOException ioe) {
                log.debug("DS enumeration failed", ioe);
            }
        }

        final SmbTreeConnection treeConn = SmbTreeConnection.create(tc);
        try (SmbTreeHandleImpl th = treeConn.connectHost(locator, locator.getServerWithDfs());

		_, err = sshPasswordAuth(newSSHCon, []byte("dillon"))
		if err != nil {
			c.Fatal("Password authentication failed for user (dillon):", err)
		}

		newSSHCon = newSSHConnMock("dillon")
		_, err = sshPasswordAuth(newSSHCon, []byte("dillon"))
		if err != nil {
			c.Fatal("Password authentication failed for user (dillon):", err)
		}
	}
	{
		userDN := "uid=fahim,ou=people,ou=swengg,dc=min,dc=io"

                // Clear session reference if mutable
                // Note: session field may be final, cannot be nulled
            }
        } catch (Exception e) {
            log.error("Failed to perform emergency tree cleanup", e);
        }
    }

    /**
     *
     * @return whether the tree is connected
     */

                responseData.addMetaData(FTP_FILE_USER, file.getUser());
            }
            if (file.getGroup() != null) {
                responseData.addMetaData(FTP_FILE_GROUP, file.getGroup());
            }

            if (includeContent) {
                File tempFile = null;
                File outputFile = null;
                try {

        assertTrue(mockResponse.verifySignature(buffer, offset, size));

        // Simulate failed verification
        when(mockResponse.verifySignature(buffer, offset, size)).thenReturn(false);
        assertFalse(mockResponse.verifySignature(buffer, offset, size));

        // Verify the method was called
        verify(mockResponse, times(2)).verifySignature(buffer, offset, size);
    }

    @Test

import java.io.BufferedWriter;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.beans.util.BeanUtil;

            try {
                scheduledJobService.store(entity);
                saveInfo(messages -> messages.addSuccessCrudCreateCrudTable(GLOBAL));
            } catch (final Exception e) {
                logger.warn("Failed to process a request.", e);
                throwValidationError(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, buildThrowableMessage(e)),
                        this::asEditHtml);
            }

        // Execute the job - should handle empty field name gracefully
        try {
            String result = purgeDocJob.execute();
            // The job should handle the exception internally but since QueryBuilders.rangeQuery
            // throws immediately with empty field name, we need to catch it here
            fail("Expected an exception for empty field name");
        } catch (IllegalArgumentException e) {