form.html

<form method="post" enctype="multipart/form-data">
<div class="panel panel-default">
  <div class="panel-body">
  <div class="form-group">
          <label for="proxy">Proxy</label>
          <input type="text" name="proxy" value=""/>
</div>
<div class="form-group">
  <label for="username">Username</label>
  <input type="text" name="username" value=""/>
  <label for="password">Password</label>
  <input type="pass" name="password" value=""/>
</div>

<div class="form-group">
  <label for="find">Find</label>
  <input type="text" name="find"/>
  <label for="replace">Replace</label>
  <input type="text" name="replace"/>
</div>
<div class="form-group">
          <label for="csv_input">Upload a CSV file</label>
          <input type="file" name="csv_input" class="input-medium" required/>
          <p>See <a href="example.csv">the example CSV file</a> for the expected format</p>
          </div>

        <input type="submit" class="btn btn-success"/>
</div>
</div>
</form>