Sets content type correctly on request

lib/validators/specValidator.js

@@ -643,6 +643,21 @@ class SpecValidator {
       } else if (location === 'body') {
         options.body = parameterValue;
         options.disableJsonStringifyOnBody = true;
+        if (operation.consumes) {
+          if (!options.headers) options.headers = {};
+
+          function isOctetStream(consumes) {
+            return consumes.some((contentType) => {
+              return contentType === 'application/octet-stream';
+            });
+          }
+
+          if (parameter.schema.format === 'file' && isOctetStream(operation.consumes)) {
+            options.headers['Content-Type'] = 'application/octet-stream';
+          } else {
+            options.headers['Content-Type'] = operation.consumes[0];
+          }
+        }
       } else if (location === 'header') {
         if (!options.headers) options.headers = {};
         options.headers[parameter.name] = parameterValue;