Please find the sample error we see in our API Logs, we see HTTP 503 error related to many APIs from the last week. I can share more errors if required, please let us know i you need any more information?
caught error: ERROR_HTTP_503; <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title>Unable to Process Request</title> <link href="/dCSS/Theme2/default/maintenance.css" type="text/css" rel="stylesheet" > </head> <body> <div id="red"> <div id="box"> <h1>Unable to Process Request</h1> <h2>We apologize for the inconvenience</h2> <br><br> The salesforce.com servers are temporarily unable to respond to your request. We apologize for the inconvenience.<br> Thank you for your patience, and please try again in a few moments. <br><br> Visit <a href=http://trust.salesforce.com>http://trust.salesforce.com</a> for current system status and availability. <br><br> <form><p class="input"><a href="javascript:history.back()" class="back">back</a><span> </span></form> </div> </div> <!-- Handled by CSP --> </body> </html>
I've seen it when you supply the wrong session id or Bearer token for a REST API call. It would probably help to know what you were calling and how. There's not a lot to glean from what's provided, IMO.
