$ _POST Not work

good afternoon I have a form q makes a search with Zillow’s API which returns me the amount and captured in another form which send user data, sending the second form I get error 404 not understand why it comes out if the first form I sent, I am using the post method in index.php

Here the code

<?php if(isset($_POST['search'])){ 

		define ('HOSTNAME', 'http://www.zillow.com/webservice/GetSearchResults.htm?');

		// Get the REST call path from the AJAX application
		// Is it a POST or a GET?

	$path = "zws-id=".$_POST['zws-id']."&address=".urlencode($_POST['address'])."&citystatezip=".urlencode($_POST['citystatezip']);

		//echo $path;
		$url = HOSTNAME.$path;

		//echo $xml;
		$xml = simplexml_load_file($url);

		if(isset($_POST['send'])){

		wp_redirect("http://www.xxxxxxxxx");

		}else{

		?>

        <form  method="POST" action="">        

        <table align="center">

        <tr>

        <td align="right" class="screen-reader-text" for="name">Name :</td>

        <td>
        <input type="hidden" name="monto" value="<?php echo $xml->response->results->result->zestimate->amount; ?>" />

        <input type="text" name="name"  value="" /></td>

        </tr>

        <tr>

        <td align="right" class="screen-reader-text" for="email">Email :</td>

        <td><input type="text" name="email"  value="" /></td>

        </tr>

        <tr>

        <td align="right" class="screen-reader-text" for="cmort">Current Mortgage Balance :</td>

        <td><input type="text" name="cmort" value="" /></td>

        </tr>

        </table>

        <input type="submit" name="send"  value="Send"  class="button"/>

        </form>

        <?php } }else{ ?>

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        <form  method="POST" action="">        

        <table align="center">

        <tr>

        <td align="right" class="screen-reader-text" for="address">Address :</td>

        <td>
        <input type="hidden" name="zws-id"  value="xxxxxxxxxxxx" />

        <input type="text" name="address"  value="" /></td>

        </tr>

        <tr>

        <td align="right" class="screen-reader-text" for="citystatezip">City State Zip :</td>

        <td><input type="text" name="citystatezip"  value="" /></td>

        </tr>

        </table>

        <input type="submit" name="search"  value="Search"  class="button"/>

        </form>

        <?php } ?>

I hope you can help me with my problem know which is my mistake