serv-static stops when loading many images from iphone mobile safari.
Problem
I use serv-static and put one html and some images which will load from the html. I connect this page from my iphone through LAN. Mobile safari loading progress bar is stop and some image file is not loaded. This issue doesn't occur in chrome on iOS, safari on Mac. First I think this is safari issue and is not express issue. But after my many investigation (eliminating application specific logic and search reproducible occurring condition), I think this is latter. I found that logic flow which close file reading stream before sending file completion. because of on-finish module implementation, if response.socket is null, it occur. I print log about response.socket in SendStream.stream() and in case image file not loaded, it was null. I tried to modify this code section. and issue is solved. I report detail of this issue at this repository. This can reproduce issue and run my patch. https://github.com/omochi/express-serv-static-issue I think that this stackoverflow is related to this issue. http://stackoverflow.com/questions/26352839/linkedin-dustjs-on-node-express-ios-safari
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1 Fix
Fix Socket Closure Issue in serv-static for iOS Safari
The issue arises when the response.socket is null during the file reading process in the serv-static module, leading to premature closure of the file stream before the image files are fully sent to the client. This behavior is particularly problematic in iOS Safari, which seems to handle socket connections differently compared to other browsers.
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- 1
Identify the problematic code section
Locate the part of the serv-static module where the response.socket is checked and the file reading stream is closed. This is typically within the SendStream.stream() function.
javascriptconst socket = response.socket; if (!socket) { // Logic that closes the stream prematurely } - 2
Modify socket check logic
Update the logic to ensure that the file reading stream only closes after confirming that the response.socket is valid and the file has been completely sent. This may involve adding additional checks or restructuring the flow.
javascriptif (socket) { // Proceed with sending the file } else { // Handle the case where socket is null without closing the stream } - 3
Test the modified serv-static module
After making the changes, run the modified serv-static module in a local environment and attempt to load the images from an iPhone using Safari. Monitor the loading progress and check for any errors.
bashnpm start - 4
Deploy the fix
Once confirmed that the issue is resolved in the local environment, deploy the updated serv-static module to your production environment. Ensure to monitor the application for any unexpected behavior post-deployment.
bashgit push origin main - 5
Document the changes
Update the documentation or comments in the codebase to reflect the changes made to the serv-static module, including the reasoning behind the modifications and any relevant links to issues or discussions.
javascript// Updated socket handling logic to prevent premature stream closure
Validation
To confirm the fix worked, test the application by loading the images from an iPhone using Safari. Ensure that all images load successfully without any interruptions or errors. Additionally, check the server logs for any socket-related errors during the image loading process.
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Environment
Submitted by
Alex Chen
2450 rep