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HAProxy vs Squid: What are the differences?

What is HAProxy? The Reliable, High Performance TCP/HTTP Load Balancer. HAProxy (High Availability Proxy) is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications.

What is Squid? A caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Squid reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.

HAProxy belongs to "Load Balancer / Reverse Proxy" category of the tech stack, while Squid can be primarily classified under "Web Cache".

Squid is an open source tool with 560 GitHub stars and 202 GitHub forks. Here's a link to Squid's open source repository on GitHub.

- No public GitHub repository available -

What is HAProxy?

HAProxy (High Availability Proxy) is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications.

What is Squid?

Squid reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.
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    What are some alternatives to HAProxy and Squid?
    nginx
    nginx [engine x] is an HTTP and reverse proxy server, as well as a mail proxy server, written by Igor Sysoev. According to Netcraft nginx served or proxied 30.46% of the top million busiest sites in Jan 2018.
    Traefik
    A modern HTTP reverse proxy and load balancer that makes deploying microservices easy. Traefik integrates with your existing infrastructure components and configures itself automatically and dynamically.
    Envoy
    Originally built at Lyft, Envoy is a high performance C++ distributed proxy designed for single services and applications, as well as a communication bus and “universal data plane” designed for large microservice “service mesh” architectures.
    Varnish
    Varnish Cache is a web application accelerator also known as a caching HTTP reverse proxy. You install it in front of any server that speaks HTTP and configure it to cache the contents. Varnish Cache is really, really fast. It typically speeds up delivery with a factor of 300 - 1000x, depending on your architecture.
    Pound
    Pound was developed to enable distributing the load among several Web-servers and to allow for a convenient SSL wrapper for those Web servers that do not offer it natively.
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    Decisions about HAProxy and Squid
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    How developers use HAProxy and Squid
    Avatar of Trello
    Trello uses HAProxyHAProxy

    We use HAProxy to load balance between our webservers. It balances TCP between the machines round robin and leaves everything else to Node.js, leaving the connections open with a reasonably long time to live to support WebSockets and re-use of a TCP connection for AJAX polling.

    Avatar of The Independent
    The Independent uses HAProxyHAProxy

    HAProxy manages internal and origin load balancing using KeepaliveD. Two small servers host the entire site, never moving about 15% load even during the largest load spikes.

    Avatar of Packet
    Packet uses HAProxyHAProxy

    We use HAProxy to balance traffic at various points in our stack, includgin nginx nodes on different physical machines, and api nodes on the backend.

    Avatar of ssshake
    ssshake uses HAProxyHAProxy

    I use HAproxy primarily for application routing and SSL termination. I also use its logs and statistics to visualize incoming traffic in Kibana.

    Avatar of Clarabridge Engage
    Clarabridge Engage uses HAProxyHAProxy

    We use HAProxy to load balance web requests for our web application, but also for some internal load balancing of microservices.

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    How much does Squid cost?
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