The User-Agent request-header field contains information about the user agent originating the request. This is for statistical purposes, the tracing of protocol violations, and automated recognition of user agents for the sake of tailoring responses to avoid particular user agent limitations. User agents SHOULD include this field with requests. The field can contain multiple product tokens.
HTTP Headers Database: Header Details of Accepts. Name: Accepts: URL: Examples: Info: bad, should be Accept: User-Agent: Jakarta: Validator.
To create a User-Agent header, begin with the name of your application, followed by a forward slash, followed by the version of the application, followed by a space, an opening parenthesis, the Language name value pair, and a closing parenthesis. The Language parameter is a required attribute, but you can add additional attributes separated by semicolons. The following example illustrates a.Instruct the user agent to activate or deactivate any heuristics used to filter or block reflected cross-site scripting attacks, equivalent to the effects of the non-standard X-XSS-Protection header. block-all-mixed-content: Prevent the user agent from loading mixed content. upgrade-insecure-requests.User Agent Client (UAC): A user agent client is a logical entity that creates a new request, and then uses the client transaction state machinery to send it. The role of UAC lasts only for the duration of that transaction. In other words, if a piece of software initiates a request, it acts as a UAC for the duration of that transaction. If it receives a request later, it assumes the role of a.
For more information, see Managing How Long Content Stays in an Edge Cache (Expiration). Client IP Addresses. If a viewer sends a request to CloudFront and does not include an X-Forwarded-For request header, CloudFront gets the IP address of the viewer from the TCP connection, adds an X-Forwarded-For header that includes the IP address, and forwards the request to the origin.Read More
Caching User-Agent specific responses with Fastly. The new FT polyfill service uses the Fastly CDN to provide faster and more reliable access to Polyfills for everyone. But with responses varying by user-agent, it’s a caching nightmare. We set out to fix this with a little help from Fastly’s engineers and custom Varnish VCL. There is so much variety in the User-Agent header that many will.Read More
The User-Agent header contains a line of text that can be used to identify a user agent and client device. Most of the time, we can find the device model and manufacturer from the User-Agent header. It may also contain information such as the client device's OS version, browser version, Java capabilities, etc. Some example User-Agent headers are provided below.Read More
User Data Header (UDH) is a binary structure which may be present at the start of a short message in the Short Message Service in GSM.It does not contain any text, but it specifies how the message should be formatted and processed. UDH can be used to form Concatenated SMS, to enrich the content of the message with colors, text formatting, small pictures and animations and simple music which.Read More
If I refresh the page or go to other pages, the user-agent header is rendered properly. I have discussed this issue on the tomcat-user list for a number of days, thinking it must be something I had done wrong, Here are the steps: 1) Request a protected page from my application. 2) My CMA login page pops up, I enter userid and password.Read More
The userAgent property returns the value of the user-agent header sent by the browser to the server. The value returned, contains information about the name, version and platform of the browser. Note: This property is read-only.Read More
A single User Agent header can include multiple agents separated by spaces. If a service integration is built upon an existing client library it is beneficial to include these library names and versions as well. Different client library versions may behave differently, so it is imperative to know which ones were used in the integration. For example, the Librato librato-metrics Ruby gem uses.Read More
The HTTP headers are used to pass additional information between the clients and the server through the request and response header. All the headers are case-insensitive, headers fields are separated by colon, key-value pairs in clear-text string format. The end of the header section denoted by an empty field header. There are a few header fields that can contain the comments. And a few.Read More
One of the things I loathe about the user agent header is the lack of reasonable maximum length, and the inconsistent way in which developers have overloaded the value. Parsing it is difficult (especially given that the length means there is a lot of scope for bad input). I would love to see user agent be a virtual header comprised of other headers. The other headers would not be mandatory.Read More