diff --git a/package.json b/package.json
index 14456728..18229513 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "test": "npm run lint-errors && npm run just-test-in-node",
     "test-in-node": "npm run lint-errors && npm run just-test-in-node",
     "just-test": "karma start --config karma.conf.js",
-    "just-test-in-node": "mocha --recursive --compilers js:babel-core/register test/core test/components test/bugs test/swagger-ui-dist-package",
+    "just-test-in-node": "mocha --recursive --compilers js:babel-core/register test/core test/components test/bugs test/swagger-ui-dist-package test/xss",
     "test-e2e": "sleep 3 && nightwatch test/e2e/scenarios/ --config test/e2e/nightwatch.json",
     "e2e-initial-render": "nightwatch test/e2e/scenarios/ --config test/e2e/nightwatch.json --group initial-render",
     "mock-api": "json-server --watch test/e2e/db.json --port 3204",
diff --git a/src/core/components/providers/markdown.jsx b/src/core/components/providers/markdown.jsx
index 2b21c10b..2ef8b6a6 100644
--- a/src/core/components/providers/markdown.jsx
+++ b/src/core/components/providers/markdown.jsx
@@ -29,7 +29,10 @@ Markdown.propTypes = {
 export default Markdown
 
 const sanitizeOptions = {
-    allowedTags: sanitize.defaults.allowedTags.concat([ "img" ]),
+    allowedTags: sanitize.defaults.allowedTags.concat([ "h1", "h2", "img" ]),
+    allowedAttributes: {
+        "img": sanitize.defaults.allowedAttributes.img.concat(["title"])
+    },
     textFilter: function(text) {
         return text.replace(/"/g, "\"")
     }
diff --git a/src/core/components/response-body.jsx b/src/core/components/response-body.jsx
index 265ff679..c55c1d6d 100644
--- a/src/core/components/response-body.jsx
+++ b/src/core/components/response-body.jsx
@@ -83,8 +83,12 @@ export default class ResponseBody extends React.Component {
       // Anything else (CORS)
     } else if (typeof content === "string") {
       bodyEl = <HighlightCode value={ content } />
-    } else {
+    } else if ( content.size > 0 ) {
+      // We don't know the contentType, but there was some content returned
       bodyEl = <div>Unknown response type</div>
+    } else {
+      // We don't know the contentType and there was no content returned
+      bodyEl = null
     }
 
     return ( !bodyEl ? null : <div>
diff --git a/src/core/plugins/download-url.js b/src/core/plugins/download-url.js
index c8dff0b8..d80e982b 100644
--- a/src/core/plugins/download-url.js
+++ b/src/core/plugins/download-url.js
@@ -7,13 +7,16 @@ export default function downloadUrlPlugin (toolbox) {
   let { fn } = toolbox
 
   const actions = {
-    download: (url)=> ({ errActions, specSelectors, specActions }) => {
+    download: (url)=> ({ errActions, specSelectors, specActions, getConfigs }) => {
       let { fetch } = fn
+      const config = getConfigs()
       url = url || specSelectors.url()
       specActions.updateLoadingStatus("loading")
       fetch({
         url,
         loadSpec: true,
+        requestInterceptor: config.requestInterceptor || (a => a),
+        responseInterceptor: config.responseInterceptor || (a => a),
         credentials: "same-origin",
         headers: {
           "Accept": "application/json,*/*"
diff --git a/src/core/plugins/oas3/wrap-components/markdown.js b/src/core/plugins/oas3/wrap-components/markdown.js
index 103a2801..2d7f27e7 100644
--- a/src/core/plugins/oas3/wrap-components/markdown.js
+++ b/src/core/plugins/oas3/wrap-components/markdown.js
@@ -1,10 +1,11 @@
 import React from "react"
+import PropTypes from "prop-types"
 import ReactMarkdown from "react-markdown"
 import { Parser, HtmlRenderer } from "commonmark"
 import { OAS3ComponentWrapFactory } from "../helpers"
 import { sanitizer } from "core/components/providers/markdown"
 
-export default OAS3ComponentWrapFactory(({ source }) => { 
+export const Markdown = ({ source }) => { 
   if ( source ) {
     const parser = new Parser()
     const writer = new HtmlRenderer()
@@ -23,4 +24,9 @@ export default OAS3ComponentWrapFactory(({ source }) => {
     )
   }
   return null
-})
\ No newline at end of file
+}
+Markdown.propTypes = {
+  source: PropTypes.string
+}
+
+export default OAS3ComponentWrapFactory(Markdown)
\ No newline at end of file
diff --git a/src/style/_layout.scss b/src/style/_layout.scss
index 9b38a700..95584a7c 100644
--- a/src/style/_layout.scss
+++ b/src/style/_layout.scss
@@ -543,14 +543,14 @@
 
 .response-col_description__inner
 {
-    span
+    div.markdown, div.renderedMarkdown
     {
         font-size: 12px;
         font-style: italic;
 
         display: block;
 
-        margin: 10px 0;
+        margin: 0;
         padding: 10px;
 
         border-radius: 4px;
diff --git a/test/components/markdown.js b/test/components/markdown.js
new file mode 100644
index 00000000..01a55e1c
--- /dev/null
+++ b/test/components/markdown.js
@@ -0,0 +1,48 @@
+/* eslint-env mocha */
+import React from "react"
+import expect from "expect"
+import { render } from "enzyme"
+import Markdown from "components/providers/markdown"
+import { Markdown as OAS3Markdown } from "corePlugins/oas3/wrap-components/markdown.js"
+
+describe("Markdown component", function() {
+    describe("Swagger 2.0", function() {
+        it("allows image elements", function() {
+            const str = `![Image alt text](http://image.source "Image title")`
+            const el = render(<Markdown source={str} />)
+            expect(el.html()).toEqual(`<div class="markdown"><p><img src="http://image.source" title="Image title"></p>\n</div>`)
+        })
+
+        it("allows heading elements", function() {
+            const str = `
+# h1
+## h2
+### h3
+#### h4
+##### h5
+###### h6`
+            const el = render(<Markdown source={str} />)
+            expect(el.html()).toEqual(`<div class="markdown"><h1>h1</h1>\n<h2>h2</h2>\n<h3>h3</h3>\n<h4>h4</h4>\n<h5>h5</h5>\n<h6>h6</h6>\n</div>`)
+        })
+    })
+
+    describe("OAS 3", function() {
+        it("allows image elements", function() {
+            const str = `![Image alt text](http://image.source "Image title")`
+            const el = render(<OAS3Markdown source={str} />)
+            expect(el.html()).toEqual(`<div class="renderedMarkdown"><div><p><img src="http://image.source" title="Image title"></p></div></div>`)
+        })
+
+        it("allows heading elements", function() {
+            const str = `
+# h1
+## h2
+### h3
+#### h4
+##### h5
+###### h6`
+            const el = render(<OAS3Markdown source={str} />)
+            expect(el.html()).toEqual(`<div class="renderedMarkdown"><div><h1>h1</h1>\n<h2>h2</h2>\n<h3>h3</h3>\n<h4>h4</h4>\n<h5>h5</h5>\n<h6>h6</h6></div></div>`)
+        })
+    })
+})
diff --git a/test/xss/info-sanitization.js b/test/xss/info-sanitization.js
new file mode 100644
index 00000000..e868fe9f
--- /dev/null
+++ b/test/xss/info-sanitization.js
@@ -0,0 +1,33 @@
+/* eslint-env mocha */
+import React from "react"
+import expect from "expect"
+import { render } from "enzyme"
+import { fromJS } from "immutable"
+import Info from "components/info"
+import Markdown from "components/providers/markdown"
+
+describe("<Info/> Sanitization", function(){
+	const dummyComponent = () => null
+	const components = {
+		Markdown
+	}
+	const props = {
+		getComponent: c => components[c] || dummyComponent,
+		info: fromJS({
+			title: "Test Title **strong** <script>alert(1)</script>",
+			description: "Description *with* <script>Markdown</script>"
+		}),
+		host: "example.test",
+		basePath: "/api"
+	}
+
+	it("renders sanitized .title content", function(){
+		let wrapper = render(<Info {...props}/>)
+		expect(wrapper.find(".title").html()).toEqual("Test Title **strong** &lt;script&gt;alert(1)&lt;/script&gt;")
+	})
+
+	it("renders sanitized .description content", function() {
+		let wrapper = render(<Info {...props}/>)
+		expect(wrapper.find(".description").html()).toEqual("<div class=\"markdown\"><p>Description <em>with</em> </p>\n</div>")
+	})
+})
diff --git a/test/xss/markdown-script-sanitization.js b/test/xss/markdown-script-sanitization.js
new file mode 100644
index 00000000..9d6624c7
--- /dev/null
+++ b/test/xss/markdown-script-sanitization.js
@@ -0,0 +1,36 @@
+/* eslint-env mocha */
+import React from "react"
+import expect from "expect"
+import { render } from "enzyme"
+import Markdown from "components/providers/markdown"
+import { Markdown as OAS3Markdown } from "corePlugins/oas3/wrap-components/markdown.js"
+
+describe("Markdown Script Sanitization", function() {
+  describe("Swagger 2.0", function() {
+    it("sanitizes <script> elements", function() {
+      const str = `script <script>alert(1)</script>`
+      const el = render(<Markdown source={str} />)
+      expect(el.html()).toEqual(`<div class="markdown"><p>script </p>\n</div>`)
+    })
+
+    it("sanitizes <img> elements", function() {
+      const str = `<img src=x onerror="alert('img-in-description')">`
+      const el = render(<Markdown source={str} />)
+      expect(el.html()).toEqual(`<div class="markdown"><p><img src="x"></p>\n</div>`)
+    })
+  })
+
+  describe("OAS 3", function() {
+    it("sanitizes <script> elements", function() {
+      const str = `script <script>alert(1)</script>`
+      const el = render(<OAS3Markdown source={str} />)
+      expect(el.html()).toEqual(`<div class="renderedMarkdown"><div><p>script </p></div></div>`)
+    })
+
+    it("sanitizes <img> elements", function() {
+      const str = `<img src=x onerror="alert('img-in-description')">`
+      const el = render(<OAS3Markdown source={str} />)
+      expect(el.html()).toEqual(`<div class="renderedMarkdown"><div><img src="x"></div></div>`)
+    })
+  })
+})