diff --git a/server/middleware/ResponseUtils.js b/server/middleware/ResponseUtils.js
deleted file mode 100644
index 146e28d..0000000
--- a/server/middleware/ResponseUtils.js
+++ /dev/null
@@ -1,88 +0,0 @@
-const fs = require('fs')
-const etag = require('etag')
-const { getContentType } = require('./FileUtils')
-
-const sendText = (res, statusCode, text) => {
-  res.writeHead(statusCode, {
-    'Content-Type': 'text/plain',
-    'Content-Length': Buffer.byteLength(text)
-  })
-
-  res.end(text)
-}
-
-const sendJSON = (res, json, maxAge = 0, statusCode = 200) => {
-  const text = JSON.stringify(json)
-
-  res.writeHead(statusCode, {
-    'Content-Type': 'application/json',
-    'Content-Length': Buffer.byteLength(text),
-    'Cache-Control': `public, max-age=${maxAge}`
-  })
-
-  res.end(text)
-}
-
-const sendInvalidURLError = (res, url) =>
-  sendText(res, 403, `Invalid URL: ${url}`)
-
-const sendNotFoundError = (res, what) =>
-  sendText(res, 404, `Not found: ${what}`)
-
-const sendServerError = (res, error) =>
-  sendText(res, 500, `Server error: ${error.message || error}`)
-
-const sendHTML = (res, html, statusCode = 200) => {
-  res.writeHead(statusCode, {
-    'Content-Type': 'text/html',
-    'Content-Length': Buffer.byteLength(html)
-  })
-
-  res.end(html)
-}
-
-const sendRedirect = (res, relativeLocation, statusCode = 302) => {
-  const location = res.req && res.req.baseUrl ? res.req.baseUrl + relativeLocation : relativeLocation
-  const html = `<p>You are being redirected to <a href="${location}">${location}</a>`
-
-  res.writeHead(statusCode, {
-    'Content-Type': 'text/html',
-    'Content-Length': Buffer.byteLength(html),
-    'Location': encodeURI(location)
-  })
-
-  res.end(html)
-}
-
-const sendFile = (res, file, stats, maxAge = 0) => {
-  let contentType = getContentType(file)
-
-  if (contentType === 'text/html')
-    contentType = 'text/plain' // We can't serve HTML because bad people :(
-
-  res.writeHead(200, {
-    'Content-Type': contentType,
-    'Content-Length': stats.size,
-    'Cache-Control': `public, max-age=${maxAge}`,
-    'ETag': etag(stats)
-  })
-
-  const stream = fs.createReadStream(file)
-
-  stream.on('error', (error) => {
-    sendServerError(res, error)
-  })
-
-  stream.pipe(res)
-}
-
-module.exports = {
-  sendText,
-  sendJSON,
-  sendInvalidURLError,
-  sendNotFoundError,
-  sendServerError,
-  sendHTML,
-  sendRedirect,
-  sendFile
-}
diff --git a/server/middleware/findFile.js b/server/middleware/findFile.js
index b67ae90..86318bc 100644
--- a/server/middleware/findFile.js
+++ b/server/middleware/findFile.js
@@ -71,7 +71,7 @@ function findFile(req, res, next) {
 
     if (queryMain) {
       if (!(queryMain in packageConfig))
-        return res.status(404).send(`Cannot find field "${queryMain}" in ${req.packageSpec}/package.json`)
+        return res.status(404).send(`Cannot find field "${queryMain}" in ${req.packageSpec} package config`)
 
       mainFilename = packageConfig[queryMain]
     } else {
diff --git a/server/middleware/serveFile.js b/server/middleware/serveFile.js
index 38d23ea..59f12ca 100644
--- a/server/middleware/serveFile.js
+++ b/server/middleware/serveFile.js
@@ -1,7 +1,32 @@
+const fs = require('fs')
 const path = require('path')
+const etag = require('etag')
 const { generateMetadata } = require('./MetadataUtils')
 const { generateDirectoryIndexHTML } = require('./IndexUtils')
-const { sendFile } = require('./ResponseUtils')
+const { getContentType } = require('./FileUtils')
+
+function sendFile(res, file, stats, maxAge = 0) {
+  let contentType = getContentType(file)
+
+  if (contentType === 'text/html')
+    contentType = 'text/plain' // We can't serve HTML because bad people :(
+
+  res.writeHead(200, {
+    'Content-Type': contentType,
+    'Content-Length': stats.size,
+    'Cache-Control': `public, max-age=${maxAge}`,
+    'ETag': etag(stats)
+  })
+
+  const stream = fs.createReadStream(file)
+
+  stream.on('error', (error) => {
+    console.error(error)
+    res.status(500).send('There was an error serving this file')
+  })
+
+  stream.pipe(res)
+}
 
 /**
  * Send the file, JSON metadata, or HTML directory listing.
@@ -18,7 +43,7 @@ function serveFile(autoIndex, maximumDepth) {
         }
       })
     } else if (req.stats.isFile()) {
-      // TODO: use res.sendFile instead of our own custom function?
+      // TODO: use res.sendFile instead of our own sendFile?
       sendFile(res, path.join(req.packageDir, req.file), req.stats, 31536000)
     } else if (autoIndex && req.stats.isDirectory()) {
       generateDirectoryIndexHTML(req.packageInfo, req.packageVersion, req.packageDir, req.file, function (error, html) {