diff --git a/rust/pact_ffi/tests/1px.gif b/rust/pact_ffi/tests/1px.gif
new file mode 100644
index 000000000..b636f4b8d
Binary files /dev/null and b/rust/pact_ffi/tests/1px.gif differ
diff --git a/rust/pact_ffi/tests/tests.rs b/rust/pact_ffi/tests/tests.rs
index 1c5d02959..a993f0223 100644
--- a/rust/pact_ffi/tests/tests.rs
+++ b/rust/pact_ffi/tests/tests.rs
@@ -1,4 +1,8 @@
+use std::env;
 use std::ffi::{CStr, CString};
+use std::fs::File;
+use std::io::Read;
+use std::path::PathBuf;
 
 use bytes::Bytes;
 use expectest::prelude::*;
@@ -23,10 +27,11 @@ use pact_ffi::mock_server::handles::{
   pactffi_message_with_metadata,
   pactffi_new_interaction,
   pactffi_new_message,
-  pactffi_new_message_pact,
+  pactffi_new_message_pact, 
   pactffi_new_pact,
   pactffi_response_status,
   pactffi_upon_receiving,
+  pactffi_with_binary_file,
   pactffi_with_body,
   pactffi_with_header,
   pactffi_with_multipart_file,
@@ -340,3 +345,69 @@ fn pactffi_verifier_cli_args_test() {
     assert!(options_flags.options.len() > 0);
     assert!(options_flags.flags.len() > 0);
 }
+
+/// Get the path to one of our sample *.json files.
+fn fixture_path(path: &str) -> PathBuf {
+  env::current_dir()
+    .expect("could not find current working directory")
+    .join("tests")
+    .join(path)
+    .to_owned()
+}
+
+#[test_log::test]
+fn pactffi_with_binary_file_feature_test() {
+  let consumer_name = CString::new("http-consumer").unwrap();
+  let provider_name = CString::new("image-provider").unwrap();
+  let pact_handle = pactffi_new_pact(consumer_name.as_ptr(), provider_name.as_ptr());
+
+  let description = CString::new("request_with_matchers").unwrap();
+  let interaction = pactffi_new_interaction(pact_handle.clone(), description.as_ptr());
+
+  let content_type = CString::new("image/gif").unwrap();
+  let path = CString::new("/upload").unwrap();
+  let address = CString::new("127.0.0.1:0").unwrap();
+  let file_path = CString::new("/tmp/pact").unwrap();
+  let description = CString::new("a request to test the FFI interface").unwrap();
+  let method = CString::new("POST").unwrap();
+
+  let mut buffer = Vec::new();
+  let gif_file = fixture_path("1px.gif");
+  File::open(gif_file).unwrap().read_to_end(&mut buffer).unwrap();
+
+  pactffi_upon_receiving(interaction.clone(), description.as_ptr());
+  pactffi_with_request(interaction.clone(), method.as_ptr(), path.as_ptr());
+  pactffi_with_binary_file(interaction.clone(), InteractionPart::Request, content_type.as_ptr(),
+                           buffer.as_ptr(), buffer.len());
+  // will respond with...
+  pactffi_response_status(interaction.clone(), 201);
+
+  let port = pactffi_create_mock_server_for_pact(pact_handle.clone(), address.as_ptr(), false);
+
+  expect!(port).to(be_greater_than(0));
+
+  let client = Client::default();
+  let result = client.post(format!("http://127.0.0.1:{}/upload", port).as_str())
+    .header("Content-Type", "image/gif")
+    .body(buffer)
+    .send();
+
+  let mismatches = unsafe {
+    CStr::from_ptr(pactffi_mock_server_mismatches(port)).to_string_lossy().into_owned()
+  };
+
+  match result {
+    Ok(res) => {
+      let status = res.status();
+      expect!(status).to(be_eq(201));
+    },
+    Err(err) => {
+      panic!("expected 201 response but request failed - {}", err);
+    }
+  };
+
+  pactffi_write_pact_file(port, file_path.as_ptr(), true);
+  pactffi_cleanup_mock_server(port);
+
+  expect!(mismatches).to(be_equal_to("[]"));
+}
diff --git a/rust/pact_matching/src/lib.rs b/rust/pact_matching/src/lib.rs
index ce581ba76..76705dbe5 100644
--- a/rust/pact_matching/src/lib.rs
+++ b/rust/pact_matching/src/lib.rs
@@ -635,8 +635,8 @@ lazy_static! {
      = [
       (|content_type| { content_type.is_json() }, json::match_json),
       (|content_type| { content_type.is_xml() }, xml::match_xml),
-      (|content_type| { content_type.base_type() == "application/octet-stream" }, binary_utils::match_octet_stream),
-      (|content_type| { content_type.base_type() == "multipart/form-data" }, binary_utils::match_mime_multipart)
+      (|content_type| { content_type.base_type() == "multipart/form-data" }, binary_utils::match_mime_multipart),
+      (|content_type| { content_type.is_binary() || content_type.base_type() == "application/octet-stream" }, binary_utils::match_octet_stream)
   ];
 }
 
@@ -1291,9 +1291,19 @@ fn compare_bodies_core(
       }
     },
     None => {
-      debug!("No body matcher defined for content type '{}', using plain text matcher", content_type);
-      if let Err(m) = match_text(&expected.body().value(), &actual.body().value(), context) {
-        mismatches.extend_from_slice(&*m);
+      debug!("No body matcher defined for content type '{}', checking for a content type matcher", content_type);
+      let path = DocPath::root();
+      if context.matcher_is_defined(&path) && context.select_best_matcher(&path).rules
+        .iter().any(|rule| if let MatchingRule::ContentType(_) = rule { true } else { false }) {
+        debug!("Found a content type matcher");
+        if let Err(m) = binary_utils::match_octet_stream(expected, actual, context) {
+          mismatches.extend_from_slice(&*m);
+        }
+      } else {
+        debug!("No body matcher defined for content type '{}', using plain text matcher", content_type);
+        if let Err(m) = match_text(&expected.body().value(), &actual.body().value(), context) {
+          mismatches.extend_from_slice(&*m);
+        }
       }
     }
   };
diff --git a/rust/pact_matching/src/tests.rs b/rust/pact_matching/src/tests.rs
index 20731e524..61ca09f22 100644
--- a/rust/pact_matching/src/tests.rs
+++ b/rust/pact_matching/src/tests.rs
@@ -659,3 +659,29 @@ fn values_matcher_defined() {
   expect!(context.values_matcher_defined(&path_x.join("0").join("z"))).to(be_false());
   expect!(context.values_matcher_defined(&path_y.join("0").join("y"))).to(be_false());
 }
+
+const IMAGE_BYTES: [u8; 16] = [ 0o107, 0o111, 0o106, 0o070, 0o067, 0o141, 0o001, 0o000, 0o001, 0o000, 0o200, 0o000, 0o000, 0o377, 0o377, 0o377 ];
+
+#[test]
+fn compare_bodies_core_should_check_for_content_type_matcher() {
+  let content_type = ContentType::parse("application/gif").unwrap();
+  let matching_rules = matchingrules!{ "body" => { "$" => [ MatchingRule::ContentType("application/gif".to_string()) ] } };
+  let expected = Request {
+    body: OptionalBody::Present(Bytes::from_static(&IMAGE_BYTES), Some(content_type.clone()), None),
+    matching_rules: matching_rules.clone(),
+    .. Request::default()
+  };
+  let actual = Request {
+    body: OptionalBody::Present(Bytes::from_static(&IMAGE_BYTES), Some(content_type.clone()), None),
+    .. Request::default()
+  };
+  let context = CoreMatchingContext::new(DiffConfig::AllowUnexpectedKeys,
+    &matching_rules.rules_for_category("body").unwrap(),
+    &hashmap!{}
+  );
+
+  let result = compare_bodies_core(&content_type, &expected, &actual, &context);
+
+  expect!(result.len()).to(be_equal_to(1));
+  expect!(result.first().unwrap().description()).to(be_equal_to("$ -> Expected binary contents to have content type 'application/gif' but detected contents was 'image/gif'"));
+}