Element API Endpoint returns data but has 404 header

Question

The url: https://www.fira.co.uk/fullmembers.json

is an endpoint for Craft's element API plugin.

It has been working fine until recently I did a few things:

• I changed the site to https
• There have been some tweaks to the server config (nginx caching etc)

The problem I am having is that the URL returns a 404 header but still displays the JSON response in the browser. This 404 is affecting my wget script that systematically saves the response to a static file, as to improve performance.

Any ideas why the endpoint would be behaving like this?

I haven't altered the elementapi.php recently but here it is:

<?php
namespace Craft;

return [
    'endpoints' => [
        'fullmembers.json' => [
            'elementType' => 'User',
            'criteria' => ['group' => 'fullMembership', 'limit' => null, 'order' => 'companyName'],
            'paginate' => false,
            'transformer' => function(UserModel $member) {
                // var_dump($member->memberAddress);
                $businessCategories = [];
                foreach ($member->businessTypeMarketSectorsProducts as $block) {
                    switch ($block->type->handle) {
                        case 'businessCategory':

                        $productValues = [];
                        foreach ($block->product as $prod) {
                            if ($prod->selected) {
                                $productValues[] = $prod->value;
                            }
                        }

                        $businessCategories[] = [
                            'businessType' => $block->businessType->value,
                            'marketSector' => $block->marketSector->value,
                            'product' => $productValues
                        ];

                        break;
                    }
                }
                // $urlslug = strtolower(implode('-',explode(" ", $member->membersCompanyName)));
                $urlslug = StringHelper::toKebabCase($member->membersCompanyName);

                return [
                    'id' => $member->id,
                    'companyName' => $member->membersCompanyName,
                    // 'memberAddress' => $member->memberAddress->attributes,
                    'lat' => $member->memberAddress->lat,
                    'lng' => $member->memberAddress->lng,
                    'city' => $member->memberAddress->city,
                    'street1' => $member->memberAddress->street1,
                    'street2' => $member->memberAddress->street2,
                    'street3' => $member->membersAddressLine3,
                    'zip' => $member->memberAddress->zip,
                    'country' => $member->memberAddress->country,
                    'email' => $member->email,
                    'phone' => $member->membersPhoneNumber,
                    'profile' => UrlHelper::getUrl("directory/company/{$member->id}/{$urlslug}"),
                    'businessCategories' => $businessCategories
                ];
            },
        ]
    ]
];

Answer 1

Removing this from my site's nginx conf fixed it:

location ~* \.(?:manifest|appcache|html?|xml|json)$ {
 expires -1;
}

However, what I really want to do is cache stuff, without breaking this endpoint

Answer 2

Updating the following line in our NGINX configuration also fixed the problem, this is similar to expires -1:

From

# cache.appcache, your document html and data
location ~* \.(?:manifest|appcache|html?|xml|json)$ {
  add_header Cache-Control "max-age=0";
}

To

# cache.appcache, your document html and data
location ~* \.(?:manifest|appcache|html?|xml)$ {
  add_header Cache-Control "max-age=0";
}