diff --git a/lib/har.js b/lib/har.js
index 83453a327..ceb1cd107 100644
--- a/lib/har.js
+++ b/lib/har.js
@@ -60,43 +60,53 @@ Har.prototype.prep = function (data) {
   }
 
   // prep body
-  switch (data.postData.mimeType) {
-    case 'multipart/mixed':
-    case 'multipart/related':
-    case 'multipart/form-data':
-    case 'multipart/alternative':
-      // reset values
-      data.postData.mimeType = 'multipart/form-data'
-      break
-
-    case 'application/x-www-form-urlencoded':
-      if (!data.postData.params) {
-        data.postData.text = ''
-      } else {
-        data.postData.paramsObj = data.postData.params.reduce(this.reducer, {})
-
-        // always overwrite
-        data.postData.text = qs.stringify(data.postData.paramsObj)
-      }
-      break
-
-    case 'text/json':
-    case 'text/x-json':
-    case 'application/json':
-    case 'application/x-json':
-      data.postData.mimeType = 'application/json'
-
-      if (data.postData.text) {
-        try {
-          data.postData.jsonObj = JSON.parse(data.postData.text)
-        } catch (e) {
-          this.request.debug(e)
-
-          // force back to text/plain
-          data.postData.mimeType = 'text/plain'
-        }
+  function some (arr) {
+    return arr.some(function (type) {
+      return data.postData.mimeType.indexOf(type) === 0
+    })
+  }
+
+  if (some([
+    'multipart/mixed',
+    'multipart/related',
+    'multipart/form-data',
+    'multipart/alternative'])) {
+
+    // reset values
+    data.postData.mimeType = 'multipart/form-data'
+  }
+
+  else if (some([
+    'application/x-www-form-urlencoded'])) {
+
+    if (!data.postData.params) {
+      data.postData.text = ''
+    } else {
+      data.postData.paramsObj = data.postData.params.reduce(this.reducer, {})
+
+      // always overwrite
+      data.postData.text = qs.stringify(data.postData.paramsObj)
+    }
+  }
+
+  else if (some([
+    'text/json',
+    'text/x-json',
+    'application/json',
+    'application/x-json'])) {
+
+    data.postData.mimeType = 'application/json'
+
+    if (data.postData.text) {
+      try {
+        data.postData.jsonObj = JSON.parse(data.postData.text)
+      } catch (e) {
+        this.request.debug(e)
+
+        // force back to text/plain
+        data.postData.mimeType = 'text/plain'
       }
-      break
+    }
   }
 
   return data
@@ -152,51 +162,50 @@ Har.prototype.options = function (options) {
     options.headers = req.headersObj
   }
 
-  switch (req.postData.mimeType) {
-    case 'application/x-www-form-urlencoded':
-      options.form = req.postData.paramsObj
-      break
-
-    case 'application/json':
-      if (req.postData.jsonObj) {
-        options.body = req.postData.jsonObj
-        options.json = true
-      }
-      break
-
-    case 'multipart/form-data':
-      options.formData = {}
+  function test (type) {
+    return req.postData.mimeType.indexOf(type) === 0
+  }
+  if (test('application/x-www-form-urlencoded')) {
+    options.form = req.postData.paramsObj
+  }
+  else if (test('application/json')) {
+    if (req.postData.jsonObj) {
+      options.body = req.postData.jsonObj
+      options.json = true
+    }
+  }
+  else if (test('multipart/form-data')) {
+    options.formData = {}
 
-      req.postData.params.forEach(function (param) {
-        var attachment = {}
+    req.postData.params.forEach(function (param) {
+      var attachment = {}
 
-        if (!param.fileName && !param.fileName && !param.contentType) {
-          options.formData[param.name] = param.value
-          return
-        }
+      if (!param.fileName && !param.fileName && !param.contentType) {
+        options.formData[param.name] = param.value
+        return
+      }
 
-        // attempt to read from disk!
-        if (param.fileName && !param.value) {
-          attachment.value = fs.createReadStream(param.fileName)
-        } else if (param.value) {
-          attachment.value = param.value
-        }
+      // attempt to read from disk!
+      if (param.fileName && !param.value) {
+        attachment.value = fs.createReadStream(param.fileName)
+      } else if (param.value) {
+        attachment.value = param.value
+      }
 
-        if (param.fileName) {
-          attachment.options = {
-            filename: param.fileName,
-            contentType: param.contentType ? param.contentType : null
-          }
+      if (param.fileName) {
+        attachment.options = {
+          filename: param.fileName,
+          contentType: param.contentType ? param.contentType : null
         }
-
-        options.formData[param.name] = attachment
-      })
-      break
-
-    default:
-      if (req.postData.text) {
-        options.body = req.postData.text
       }
+
+      options.formData[param.name] = attachment
+    })
+  }
+  else {
+    if (req.postData.text) {
+      options.body = req.postData.text
+    }
   }
 
   return options
diff --git a/tests/fixtures/har.json b/tests/fixtures/har.json
index 49799374c..4864a1b28 100644
--- a/tests/fixtures/har.json
+++ b/tests/fixtures/har.json
@@ -8,7 +8,7 @@
       }
     ],
     "postData": {
-      "mimeType": "application/x-www-form-urlencoded",
+      "mimeType": "application/x-www-form-urlencoded; charset=UTF-8",
       "params": [
         {
           "name": "foo",