Configuring Squid as a server surrogate in .NET Integrate QR Code JIS X 0510 in .NET Configuring Squid as a server surrogate

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Configuring Squid as a server surrogate generate, create qr code none on .net projects Bar Code Types To configur Visual Studio .NET Quick Response Code e Squid as a server surrogate, we need to provide the appropriate options with various directives, depending on the requirements. We can configure Squid to act as a forward proxy and server surrogate at the same time.

However, the access control rules must be written very carefully in such cases, which we will cover in our special section on Access Control Configuration for surrogate servers. However, to omit any possible confusion, it"s always better to have a dedicated instance of Squid for server acceleration and a separate instance for the forward proxy..

[ 223 ]. Squid in Reverse Proxy Mode Also, as Sq uid will be listening on port 80 to accept HTTP requests, our web server can"t listen on the same IP address as Squid. In this scenario, we have the following options: Squid can listen on port 80 on the public IP address and the web server can listen on port 80 on the loopback (127.0.

0.1) address. The web server can listen on port 80 on a virtual network interface with an IP address from the private address space.

If the web server and Squid are on different machines, then this is not going to be a problem at all.. HTTP port As we learn ed that Squid will be accepting HTTP requests on behalf of the web servers sitting behind it, the most important configuration directive is http_port. We need to set the HTTP port with the appropriate options. Let"s have a look at the general format of http_port for configuring Squid in the reverse proxy mode.

. http_port 80 accel [options]. So, we need to specify a port number, such as 80. Apart from the port, we need to use the option accel, which will tell Squid that port 80 will be used for server acceleration. Also, there are additional options that are required to properly configure Squid so that it can communicate with the web servers.

. Please note QR Code ISO/IEC18004 for .NET that while configuring Squid in surrogate mode, we need to specify at least one option from defaultsite, vhost, or vport. We should also note that the CONNECT requests are blocked from receiving accel flagged ports.

. HTTP options in reverse proxy mode Let"s have a look at the other options that can be used with the http_port directive. defaultsite The option defaultsite (defaultsite=domain_name) specifies the domain name or site that will be used to construct the Host HTTP header if it is missing. The domain name here is the public domain name that a visitor types in his/her browser to access the website. vhost If we specify the option vhost, Squid will support domains hosted as virtualhosts.

vport To enable IP-based virtual host support, we can use the vport option. The option vport can be specified in the following two ways:. [ 224 ]. 9 . If we speci QRCode for .NET fy the vport option, Squid will use the port from the Host HTTP header. If the port in the Host header is missing, then it"ll use http_port (port) for virtual host support.

If we specify the vport option along with the port (vport=PORT_NUMBER), Squid will use PORT_NUMBER instead of the port specified with http_port.. allow-direc t The direct forwarding of requests is denied in reverse proxy mode, by default, for security reasons. When we have direct forwarding enabled in reverse proxy mode, a rogue client may send a forged request with any external domain name in the Host HTTP header and Squid will fetch and forward the response to the client. This will permit relay attacks.

A very strict access control is required to prevent such attacks when direct forwarding is enabled. If we want, we can enable direct forwarding by specifying the option allow-direct. protocol The protocol (protocol=STRING) option can be used to reconstruct the requests.

The default is HTTP. ignore-cc The HTTP requests carry Cache-Control HTTP headers from the clients which determine whether the cached response should be flushed or reloaded. If we use the option ignorecc, the Cache-Control headers will be ignored and Squid will serve the cached response if it"s still fresh.

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