diff --git a/src/http.js b/src/http.js
index fd314ca8f..97e69ea3e 100644
--- a/src/http.js
+++ b/src/http.js
@@ -3,6 +3,7 @@ import qs from 'qs'
 import jsYaml from 'js-yaml'
 import isString from 'lodash/isString'
 import isFunction from 'lodash/isFunction'
+import isNil from 'lodash/isNil'
 import FormData from './internal/form-data-monkey-patch'
 
 // For testing
@@ -182,9 +183,16 @@ function formatValue(input, skipEncoding) {
   }
 
   let encodeFn = encodeURIComponent
+  // skipEncoding is an option to skip using the encodeURIComponent
+  // and allow reassignment to a different "encoding" function
+  // we should only use encodeURIComponent for known url strings
   if (skipEncoding) {
-    if (isString(value)) encodeFn = str => str
-    else encodeFn = obj => JSON.stringify(obj)
+    if (isString(value) || Array.isArray(value)) {
+      encodeFn = str => str
+    }
+    else {
+      encodeFn = obj => JSON.stringify(obj)
+    }
   }
 
   if (typeof value === 'object' && !Array.isArray(value)) {
@@ -214,7 +222,7 @@ function buildFormData(reqForm) {
    * @return {FormData} - new FormData instance
    */
   return Object.entries(reqForm).reduce((formData, [name, input]) => {
-    if (!input.collectionFormat && !input.isOAS3formatArray) {
+    if ((isNil(input.collectionFormat) || input.collectionFormat !== 'multi') && !input.isOAS3formatArray) {
       formData.append(name, formatValue(input, true))
     }
     else {
diff --git a/test/data/sample-multipart-oas2.js b/test/data/sample-multipart-oas2.js
index 88eca377b..0ac125733 100644
--- a/test/data/sample-multipart-oas2.js
+++ b/test/data/sample-multipart-oas2.js
@@ -56,12 +56,62 @@ export default {
           {
             in: 'formData',
             name: 'email[]',
-            description: 'The list of emails.',
+            description: 'The list of emails as multi.',
             type: 'array',
             collectionFormat: 'multi',
             items: {
               type: 'string'
             }
+          },
+          {
+            in: 'formData',
+            name: 'none[]',
+            description: 'The list of emails as none.',
+            type: 'array',
+            collectionFormat: 'none',
+            items: {
+              type: 'string'
+            }
+          },
+          {
+            in: 'formData',
+            name: 'csv[]',
+            description: 'The list of emails as csv.',
+            type: 'array',
+            collectionFormat: 'csv',
+            items: {
+              type: 'string'
+            }
+          },
+          {
+            in: 'formData',
+            name: 'tsv[]',
+            description: 'The list of emails as tsv.',
+            type: 'array',
+            collectionFormat: 'tsv',
+            items: {
+              type: 'string'
+            }
+          },
+          {
+            in: 'formData',
+            name: 'ssv[]',
+            description: 'The list of emails as ssv.',
+            type: 'array',
+            collectionFormat: 'ssv',
+            items: {
+              type: 'string'
+            }
+          },
+          {
+            in: 'formData',
+            name: 'pipes[]',
+            description: 'The list of emails as pipes.',
+            type: 'array',
+            collectionFormat: 'pipes',
+            items: {
+              type: 'string'
+            }
           }
         ],
         responses: {
diff --git a/test/http-multipart.js b/test/http-multipart.js
index d878d2be0..658fa6d0b 100644
--- a/test/http-multipart.js
+++ b/test/http-multipart.js
@@ -23,11 +23,16 @@ describe('buildRequest - openapi 2.0', () => {
       parameters: {
         'formData.hhlContent:sort': 'id',
         'formData.hhlContent:order': 'desc',
-        'formData.email[]': ["person1", "person2"] // eslint-disable-line quotes
+        'formData.email[]': ["person1", "person2"], // eslint-disable-line quotes
+        'formData.none[]': ['foo', 'bar'],
+        'formData.csv[]': ['foo', 'bar'],
+        'formData.tsv[]': ['foo', 'bar'],
+        'formData.ssv[]': ['foo', 'bar'],
+        'formData.pipes[]': ['foo', 'bar'],
       }
     })
 
-    test('should return FormData entry list and entry item entries (in order)', () => {
+    test('should return appropriate response media type', () => {
       expect(req).toMatchObject({
         method: 'POST',
         url: '/api/v1/land/content/ViewOfAuthOwner',
@@ -36,14 +41,50 @@ describe('buildRequest - openapi 2.0', () => {
           'Content-Type': 'multipart/form-data'
         },
       })
+    })
+
+    test('should build request body as FormData', () => {
       const validateFormDataInstance = req.body instanceof FormData
       expect(validateFormDataInstance).toEqual(true)
+    })
+
+    test('should return "collectionFormat: multi" as FormData entry list and entry item entries (in order)', () => {
       const itemEntries = req.body.getAll('email[]')
       expect(itemEntries.length).toEqual(2)
       expect(itemEntries[0]).toEqual('person1')
       expect(itemEntries[1]).toEqual('person2')
     })
 
+    test('should return "collectionFormat: none" as single FormData entry in csv format', () => {
+      const itemEntriesNone = req.body.getAll('none[]')
+      expect(itemEntriesNone.length).toEqual(1)
+      expect(itemEntriesNone[0]).toEqual('foo,bar')
+    })
+
+    test('should return "collectionFormat: csv" as single FormData entry in csv format', () => {
+      const itemEntriesCsv = req.body.getAll('csv[]')
+      expect(itemEntriesCsv.length).toEqual(1)
+      expect(itemEntriesCsv[0]).toEqual('foo,bar')
+    })
+
+    test('should return "collectionFormat: tsv" as single FormData entry in tsv format', () => {
+      const itemEntriesTsv = req.body.getAll('tsv[]')
+      expect(itemEntriesTsv.length).toEqual(1)
+      expect(itemEntriesTsv[0]).toEqual('foo%09bar')
+    })
+
+    test('should return "collectionFormat: ssv" as single FormData entry in ssv format', () => {
+      const itemEntriesSsv = req.body.getAll('ssv[]')
+      expect(itemEntriesSsv.length).toEqual(1)
+      expect(itemEntriesSsv[0]).toEqual('foo%20bar')
+    })
+
+    test('should return "collectionFormat: pipes" as single FormData entry in pipes format', () => {
+      const itemEntriesPipes = req.body.getAll('pipes[]')
+      expect(itemEntriesPipes.length).toEqual(1)
+      expect(itemEntriesPipes[0]).toEqual('foo|bar')
+    })
+
     /**
      * Dev test only: assumes local server exists for POST
      * Expect server response format: { message: 'ok', data: returnData }
@@ -113,7 +154,7 @@ describe('buildRequest - openapi 3.0', () => {
       }
     })
 
-    test('should return FormData entry list and item entries (in order)', () => {
+    test('should return appropriate response media type', () => {
       expect(req).toMatchObject({
         method: 'POST',
         url: '/api/v1/land/content/ViewOfAuthOwner',
@@ -122,13 +163,20 @@ describe('buildRequest - openapi 3.0', () => {
           'Content-Type': 'multipart/form-data'
         },
       })
+    })
+
+    test('should build request body as FormData', () => {
       const validateFormDataInstance = req.body instanceof FormData
       expect(validateFormDataInstance).toEqual(true)
+    })
+
+    test('should return FormData entry list and item entries (in order)', () => {
       const itemEntries = req.body.getAll('email[]')
       expect(itemEntries.length).toEqual(2)
       expect(itemEntries[0]).toEqual('person1')
       expect(itemEntries[1]).toEqual('person2')
     })
+
     /**
      * Dev test only: assumes local server exists for POST
      * Expect server response format: { message: 'ok', data: returnData }