--- title: HttpClient vs IHttpClientFactory in .NET | daily.dev description: Using HttpClient directly in .NET has two common pitfalls: wrapping it in a using block causes socket exhaustion because sockets aren't released immediately,... canonical: https://daily.dev/posts/httpclient-vs-ihttpclientfactory-in-net-ebzyfmtc8 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: HttpClient vs IHttpClientFactory in .NET | daily.dev og:description: Using HttpClient directly in .NET has two common pitfalls: wrapping it in a using block causes socket exhaustion because sockets aren't released immediately,... og:url: https://daily.dev/posts/httpclient-vs-ihttpclientfactory-in-net-ebzyfmtc8 og:image: https://api.daily.dev/og/posts/EbzYfMtc8.png og:image:alt: HttpClient vs IHttpClientFactory in .NET og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # HttpClient vs IHttpClientFactory in .NET **[We Are .NET](https://daily.dev/sources/wearedotnet)** · 1 min read · 6 upvotes · 0 comments ## Summary Using HttpClient directly in .NET has two common pitfalls: wrapping it in a using block causes socket exhaustion because sockets aren't released immediately, while making it static causes stale DNS issues. IHttpClientFactory solves both problems by managing a pool of HttpMessageHandler instances. Each HttpClient from the factory is a lightweight shell sharing reused handlers that are recycled on a configurable interval, providing both port safety and DNS refresh. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Why does disposing HttpClient in a using block cause socket exhaustion in .NET? Disposing an HttpClient does not immediately release the underlying socket, so under load repeated creation and disposal exhausts available ports and triggers socket exceptions. This happens even though HttpClient implements IDisposable, making the using-block pattern feel correct while actually being harmful in high-throughput scenarios. _Developers debugging socket exhaustion in .NET services can find similar HttpClient pitfalls explained on daily.dev._ ### What is the downside of making HttpClient a static singleton instance in .NET? A static HttpClient keeps its connection open indefinitely, which means it misses DNS changes since the underlying connection is never refreshed. This can cause requests to keep going to a stale IP address after a DNS update, even though it avoids the socket exhaustion problem seen with per-request disposal. _Teams choosing between HttpClient patterns can weigh these trade-offs alongside other .NET guidance on daily.dev._ ### How does IHttpClientFactory manage HttpClient instances differently from creating them manually in .NET? IHttpClientFactory manages a pool of HttpMessageHandler instances rather than HttpClient instances themselves. Each HttpClient obtained from the factory is a lightweight shell, while the underlying handler is reused across requests and recycled on a configurable interval, giving both pool safety against socket exhaustion and DNS refresh support. _Developers implementing HTTP calls in .NET can compare factory-based patterns like this via daily.dev._ ## Similar posts on daily.dev - [ASP.NET, Factory Patterns, and the Illusion of Control](https://daily.dev/posts/asp-net-factory-patterns-and-the-illusion-of-control-up6aoiahc) · We Are .NET · 3 upvotes · 0 comments - [Implementing RFC-compliant HTTP caching for HttpClient in .NET](https://daily.dev/posts/implementing-rfc-compliant-http-caching-for-httpclient-in-net-ckf4syuwc) · Meziantou · 5 upvotes · 1 comments --- Tags: [#database](https://daily.dev/tags/database), [#.net](https://daily.dev/tags/.net), [#c#](https://daily.dev/tags/c#) [View this post on daily.dev](https://daily.dev/posts/httpclient-vs-ihttpclientfactory-in-net-ebzyfmtc8) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"HttpClient vs IHttpClientFactory in .NET","url":"https://daily.dev/posts/httpclient-vs-ihttpclientfactory-in-net-ebzyfmtc8","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/httpclient-vs-ihttpclientfactory-in-net-ebzyfmtc8"},"datePublished":"2026-08-05T15:42:42.995Z","dateModified":"2026-09-14T08:19:23.029Z","description":"Using HttpClient directly in .NET has two common pitfalls: wrapping it in a using block causes socket exhaustion because sockets aren't released immediately,...","image":"https://i.ytimg.com/vi/UBy0UmpqKNU/sddefault.jpg","thumbnailUrl":"https://i.ytimg.com/vi/UBy0UmpqKNU/sddefault.jpg","isAccessibleForFree":true,"articleSection":"We Are .NET","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"We Are .NET","logo":"https://media.daily.dev/image/upload/s--BsnVOa3i--/f_auto/v1718347410/logos/wearedotnet","url":"https://daily.dev/sources/wearedotnet"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/httpclient-vs-ihttpclientfactory-in-net-ebzyfmtc8","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":6},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"database,.net,c#","timeRequired":"PT1M","video":{"@type":"VideoObject","name":"HttpClient vs IHttpClientFactory in .NET","description":"Using HttpClient directly in .NET has two common pitfalls: wrapping it in a using block causes socket exhaustion because sockets aren't released immediately,...","thumbnailUrl":"https://i.ytimg.com/vi/UBy0UmpqKNU/sddefault.jpg","uploadDate":"2026-08-05T15:42:42.995Z","duration":"PT1M","url":"https://api.daily.dev/r/EbzYfMtc8","embedUrl":"https://www.youtube.com/embed/UBy0UmpqKNU"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"We Are .NET","item":"https://daily.dev/sources/wearedotnet"},{"@type":"ListItem","position":3,"name":"HttpClient vs IHttpClientFactory in .NET"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/httpclient-vs-ihttpclientfactory-in-net-ebzyfmtc8#faq","mainEntity":[{"@type":"Question","name":"Why does disposing HttpClient in a using block cause socket exhaustion in .NET?","acceptedAnswer":{"@type":"Answer","text":"Disposing an HttpClient does not immediately release the underlying socket, so under load repeated creation and disposal exhausts available ports and triggers socket exceptions. 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