diff --git a/rest-client-base/src/main/java/com/wultra/core/rest/client/base/DefaultRestClient.java b/rest-client-base/src/main/java/com/wultra/core/rest/client/base/DefaultRestClient.java
index befdb3c..3ebdb10 100644
--- a/rest-client-base/src/main/java/com/wultra/core/rest/client/base/DefaultRestClient.java
+++ b/rest-client-base/src/main/java/com/wultra/core/rest/client/base/DefaultRestClient.java
@@ -363,7 +363,7 @@ public <T> ResponseEntity<T> post(String path, Object request, MultiValueMap<Str
                             h.addAll(headers);
                         }
                     })
-                    .contentType(config.getContentType())
+                    .contentType(resolveContentType(config, headers))
                     .accept(config.getAcceptType());
             return buildRequest(spec, request)
                     .exchangeToMono(rs -> handleResponse(rs, responseType))
@@ -398,7 +398,7 @@ public <T> void postNonBlocking(String path, Object request, MultiValueMap<Strin
                             h.addAll(headers);
                         }
                     })
-                    .contentType(config.getContentType())
+                    .contentType(resolveContentType(config, headers))
                     .accept(config.getAcceptType());
             buildRequest(spec, request)
                     .exchangeToMono(rs -> handleResponse(rs, responseType))
@@ -444,7 +444,7 @@ public <T> ResponseEntity<T> put(String path, Object request, MultiValueMap<Stri
                             h.addAll(headers);
                         }
                     })
-                    .contentType(config.getContentType())
+                    .contentType(resolveContentType(config, headers))
                     .accept(config.getAcceptType());
             return buildRequest(spec, request)
                     .exchangeToMono(rs -> handleResponse(rs, responseType))
@@ -472,7 +472,7 @@ public <T> void putNonBlocking(String path, Object request, MultiValueMap<String
                             h.addAll(headers);
                         }
                     })
-                    .contentType(config.getContentType())
+                    .contentType(resolveContentType(config, headers))
                     .accept(config.getAcceptType());
             buildRequest(spec, request)
                     .exchangeToMono(rs -> handleResponse(rs, responseType))
@@ -586,7 +586,7 @@ public <T> ResponseEntity<T> patch(String path, Object request, MultiValueMap<St
                             h.addAll(headers);
                         }
                     })
-                    .contentType(config.getContentType())
+                    .contentType(resolveContentType(config, headers))
                     .accept(config.getAcceptType());
             return buildRequest(spec, request)
                     .exchangeToMono(rs -> handleResponse(rs, responseType))
@@ -614,7 +614,7 @@ public <T> void patchNonBlocking(String path, Object request, MultiValueMap<Stri
                             h.addAll(headers);
                         }
                     })
-                    .contentType(config.getContentType())
+                    .contentType(resolveContentType(config, headers))
                     .accept(config.getAcceptType());
             buildRequest(spec, request)
                     .exchangeToMono(rs -> handleResponse(rs, responseType))
@@ -770,6 +770,15 @@ private <T> Mono<ResponseEntity<T>> handleResponse(ClientResponse response, Para
         });
     }
 
+    private static MediaType resolveContentType(final RestClientConfiguration config, final MultiValueMap<String, String> headers) {
+        if (headers != null && headers.containsKey(HttpHeaders.CONTENT_TYPE)) {
+            final MediaType contentType = MediaType.valueOf(headers.getFirst(HttpHeaders.CONTENT_TYPE));
+            logger.debug("Overriding content type {} from config by {} from the given headers", config.getContentType(), contentType);
+            return contentType;
+        }
+        return config.getContentType();
+    }
+
     /**
      * In case base URL is specified, append the path to complete the URL. Otherwise use the path as the URL specification.
      * @param uriSpec Request headers URI specification.
diff --git a/rest-client-base/src/test/java/com/wultra/core/rest/client/base/DefaultRestClientTest.java b/rest-client-base/src/test/java/com/wultra/core/rest/client/base/DefaultRestClientTest.java
index 3e872fa..d19db5f 100644
--- a/rest-client-base/src/test/java/com/wultra/core/rest/client/base/DefaultRestClientTest.java
+++ b/rest-client-base/src/test/java/com/wultra/core/rest/client/base/DefaultRestClientTest.java
@@ -662,6 +662,23 @@ void testPostWithMultipartData() throws RestClientException {
         assertEquals(requestData, responseEntity.getBody().getResponseObject().getResponse());
     }
 
+    @Test
+    void testPostOctetStream() throws Exception {
+        final byte[] request = {1, 2};
+
+        final HttpHeaders headers = new HttpHeaders();
+        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
+
+        final ResponseEntity<ObjectResponse<TestResponse>> responseEntity =
+                restClient.post("/octet-stream", request, null, headers, new ParameterizedTypeReference<>(){});
+
+        assertNotNull(responseEntity);
+        assertNotNull(responseEntity.getBody());
+        assertNotNull(responseEntity.getBody().getResponseObject());
+        assertEquals("OK", responseEntity.getBody().getStatus());
+        assertEquals("length: 2", responseEntity.getBody().getResponseObject().getResponse());
+    }
+
     @Test
     void testPostWithLargeServerResponse() {
         final Logger defaultRestClientLogger = (Logger) LoggerFactory.getLogger(DefaultRestClient.class);
diff --git a/rest-client-base/src/test/java/com/wultra/core/rest/client/base/controller/PublicTestRestController.java b/rest-client-base/src/test/java/com/wultra/core/rest/client/base/controller/PublicTestRestController.java
index 874f6c1..b2c8ad4 100644
--- a/rest-client-base/src/test/java/com/wultra/core/rest/client/base/controller/PublicTestRestController.java
+++ b/rest-client-base/src/test/java/com/wultra/core/rest/client/base/controller/PublicTestRestController.java
@@ -21,13 +21,13 @@
 import io.getlime.core.rest.model.base.request.ObjectRequest;
 import io.getlime.core.rest.model.base.response.ObjectResponse;
 import io.getlime.core.rest.model.base.response.Response;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
-import jakarta.servlet.http.HttpServletRequest;
-import jakarta.servlet.http.HttpServletResponse;
 import java.net.URI;
 import java.util.Arrays;
 import java.util.Enumeration;
@@ -85,6 +85,12 @@ public ObjectResponse<TestResponse> testPostWithMultipartRequestAndResponse(@Req
         return new ObjectResponse<>(testResponse);
     }
 
+    @PostMapping(value = "/octet-stream", consumes = MediaType.APPLICATION_OCTET_STREAM_VALUE)
+    public ObjectResponse<TestResponse> testPostOctetStream(@RequestBody byte[] request) {
+        final TestResponse testResponse = new TestResponse("length: " + request.length);
+        return new ObjectResponse<>(testResponse);
+    }
+
     @PostMapping("/object-response-large")
     public ObjectResponse<TestResponse> testPostWithLargeServerResponse() {
         TestResponse testResponse = new TestResponse(Arrays.toString(new byte[10 * 1024 * 1024]));