Twitter API 502 Bad Gateway
There are two main causes for a "502 Bad Gateway" error when using the Twitter API. Of the two, one is likely to have to do with a problem with your own application, and the other reflects an issue with the Twitter service. In either case, this error is typically temporary, and has its root cause in the sheer number of requests Twitter's servers receive on a continual basis.
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The Twitter API
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The Twitter API provides an interface between Twitter and your own website. With the API, you can create apps that tap into the Twitter service, allowing your visitors to interact with Twitter from your site and removing the need for them to leave your site to do so. The API, or Application Programming Interface, is a script that you can implement from your site and build upon. The API does not allow users to input their Twitter account data into your site. Instead, it uses an intermediary service known as "OAuth."
OAuth
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OAuth, or Open Authorization, is a standardized interface between two sites through which users can exchange sensitive information without the risk of it being intercepted. OAuth accomplishes this by issuing tokens. Once your user logs into Twitter from its main site, he can then engage Twitter from your site using the Twitter API without typing in his password again. This is because OAuth communicates with Twitter behind the scenes to verify that he has logged in. It then gives the user a token, or pass, to use Twitter on your site for a given amount of time. Sometimes, however, communication between your site and Twitter's does not go smoothly.
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Server Load
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If you or your users receive the "502 Bad Gateway" error while using an app that you created with the Twitter API, it may be because Twitter's servers are overloaded. It can also occur because your app is attempting to download too much data at once. For instance, if you have your app set to retrieve more 100 tweets per page, you may encounter this error. Consider scaling this back to 50 tweets per page.
Site Maintenance
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You also will receive the "502 Bad Gateway" error from your app if Twitter's site is down for maintenance or for any other reason. You can confirm this by opening a Web browser and navigating directly to Twitter. Any app that you create with the Twitter API is completely dependent on Twitter's main service. If the servers are unresponsive, your app will return a 502 error until it receives information from Twitter.
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