June 6, 2026
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Ghulam Mustafa

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Tag: expressjs

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How to Fix CORS Blocked Errors in Express.js APIs Under Production Domains

Ghullam Mustafa14 mins

Deploying a decoupled full-stack application frequently introduces one of the most frustrating security roadblocks in modern web development: Access to XMLHttpRequest at ‘API_URL’ from origin ‘FRONTEND_URL’ has been blocked by CORS policy. This runtime exception completely halts communication between your frontend user interface and your backend microservices. Cross-Origin Resource Sharing (CORS) is a strict browser-level…

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Express.js Gateway Timeouts OpenAI Stream Fix

How to Prevent Express.js Gateway Timeouts in OpenAI Streaming Pipelines

Ghullam Mustafa35 mins

Implementing server-sent events (SSE) to stream OpenAI responses in real-time is a fantastic way to improve user experience. However, when deploying these AI pipelines behind an Express.js backend, developers frequently hit a major production bottleneck: the 504 Gateway Timeout or internal socket hang-up error. By default, Node.js HTTP servers and middleware layers like Express enforce…

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