similarities (less) invalid algorithm

Question

My three algo's pass check50 and tests when running directly, but when uploading files / choosing the algorithm, I either get: 1) 400: The browser (or proxy) sent a request that this server could not understand. or 2) 400: Bad algorithm

I believe its down to how I'm labeling my html form inputs but unsure exactly where. Any help appreciated!

<div class="container">
    <form action="/compare" enctype="multipart/form-data" method="post">
         <!--  first file in form -->

            <label for="file1">Choose first file to upload</label>
                 <input type="file" id="file1" name="file1">
        <!--  second file in form -->

            <label for="file1">Choose second file to upload</label>
                 <input type="file" id="file2" name="file2">

        <!--  algo select -->
            <label for="algorithm">Algorithm</label>
            <select id="algorithm" name="algorithm">
              <option value="line">Line</option>
              <option value="sentence">Sentence</option>
              <option value="substring">Substring</option>
                  <input type="text" id="length" name="length" placeholder="Length of substring">
            </select>
        <!-- Div for submit button -->
            <div>
                   <button>Submit</button>
            </div>
    </form>

</div>

Answer 1

My algo select values were singular ("line") instead of plural ("lines")...little annoying mistake!