Safari AJAX glitch - Unable to load requested resource

Today, an unexpected bug has appeared in a web app I'm currently developing. Without making any changes to the code, this bug suddenly emerged:

I am sending AJAX requests (using vanilla JavaScript instead of jQuery) to our local server running MAMP PRO. Everything functions properly in Chrome and Firefox (testing on a Mac). However, when using Safari, the request consistently returns an error: Failed to load resource: the network connection was lost

If I manually try to access the URL of the request (not through AJAX), it works flawlessly. Upon testing the request with a setTimeout, I made an interesting observation:

When I make the request immediately after the page loads (within 60 milliseconds), everything works fine. After that, the connection is sporadically lost until around 6000 milliseconds, at which point it starts working again! This behavior is quite puzzling... considering I am not using any other setTimeouts, the issue seems to be specific to Safari.

Could this be a mistake on my end or just a newly discovered bug in Safari?

javascriptajaxnetworkingsafarixmlhttprequest

Answer №1

While working on a major new feature for our web application, we encountered a similar issue. Our approach involves using an XHR request from the JS client to fetch user favorites from a Tomcat server hosted on Amazon Linux. Initially, the connection functions as intended. However, when we attempt the same request again, it fails with an error message stating "Failed to load resource: the network connection was lost" in the client JS console. It seems that Safari may be interpreting the second request as an accidental duplicate of the first.

To address this issue with Tomcat, we have implemented a workaround by essentially disabling KeepAlive support. Unfortunately, this solution impacts all connections and not just those made through Safari on desktop or mobile devices. One potential fix for Tomcat is to modify a parameter on the Connector for HTTPS in the ${CATALINA_HOME}/conf/server.xml file...

maxKeepAliveRequests="1"

There may be alternative approaches to restrict this issue to only Safari connections. If I come across any such solutions, I will update this post accordingly. A more ideal solution would be to cache results within our application to circumvent this problem entirely.

Answer №2

There have been reports circulating about Safari on Mac experiencing issues with keep alive functionality. It has been suggested that disabling keep alive for Safari on Mac at the server could be a potential solution.

To implement this, you can use the following directive in your server configuration:

BrowserMatch "Safari" nokeepalive

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