A response header is an HTTP header that can be used in an HTTP response and that doesn't relate to the content of the message. Response headers, like Age, Location or Server are used to give a more detailed context of the response.
Not all headers appearing in a response are categorized as response headers by the specification. For example, the Content-Type header is a representation header indicating the original type of data in the body of the response message (prior to the encoding in the Content-Encoding representation header being applied). However, "conversationally" all headers are usually referred to as response headers in a response message.
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Not all headers appearing in a response are categorized as response headers by the specification. For example, the Content-Type header is a representation header indicating the original type of data in the body of the response message (prior to the encoding in the Content-Encoding representation header being applied). However, \"conversationally\" all headers are usually referred to as response headers in a response message.
The Server response-header field contains information about the software used by the origin server to handle the request. The field can contain multiple product tokens (section 3.8) and comments identifying the server and any significant subproducts. The product tokens are listed in order of their significance for identifying the application.
This, however, makes no mention of the purpose of this field. This seems like information disclosure to me. These server strings give away a lot of information that is great for anyone trying to fingerprint the server. Automated scanning tools would quickly identify unpatched or vulnerable servers. Having my web server present version information for itself and modules like OpenSSL seems like a bad idea.
I would think that, from a security perspective, we would want to give the enemy (ie: Everyone) as little information as possible while still allowing business to continue. Here is an interesting write-up on information warfare.
Server information should be removed from HTTP responses, and its an insecure default to leak this data. This isn't a major security risk, or even a medium security risk - but I don't feel comfortable just announcing such details to my adversaries. Having an exact version number leaks when, and how often you patch your production systems - even if the version is current. An adversary knowing the patch cycle, means that they know when you are the weakest.
The HTTP Host header probably most useful for the Netcraft Web Server Survey. But in terms of HTTP it shouldn't matter. That is why we have standards, so that clients and servers written by different vendors can work together.
It's used for whatever you want to use it for. I've found it helpful in the past for reverse-engineering compliance issues; e.g. IIS breaks HTTP/1.1 (RFC 2616) in lots of ways, but most are to the benefit of the user in terms of performance and supported by most browsers. Actually most current browsers no longer comply with the rules in RFC 2616 (now 13 years old).
Anyone who is reasonably competent should be able to determine the server type (although I've not tried this with HTTP servers, a few years ago, I was conducting a survey of SMTP servers - with an average of 2.1 commands, I could find the type and take a good guess at the major version number of MTAs from 12 different vendors).
My question: The API, I am working with has been coded in a way that the TOKEN which I want does not appears in the body or headers section. Instead it comes in console under Response Header. How can I get that value?
HTTP header fields are a list of strings sent and received by both the client program and server on every HTTP request and response. These headers are usually invisible to the end-user and are only processed or logged by the server and client applications. They define how information sent/received through the connection are encoded (as in Content-Encoding), the session verification and identification of the client (as in browser cookies, IP address, user-agent) or their anonymity thereof (VPN or proxy masking, user-agent spoofing), how the server should handle data (as in Do-Not-Track), the age (the time it has resided in a shared cache) of the document being downloaded, amongst others.
In HTTP version 1.x, header fields are transmitted after the request line (in case of a request HTTP message) or the response line (in case of a response HTTP message), which is the first line of a message. Header fields are colon-separated key-value pairs in clear-text string format, terminated by a carriage return (CR) and line feed (LF) character sequence. The end of the header section is indicated by an empty field line, resulting in the transmission of two consecutive CR-LF pairs. In the past, long lines could be folded into multiple lines; continuation lines are indicated by the presence of a space (SP) or horizontal tab (HT) as the first character on the next line. This folding was deprecated in RFC 7230.[1]
HTTP/2[2] and HTTP/3 instead use a binary protocol, where headers are encoded in a single HEADERS and zero or more CONTINUATION frames using HPACK[3] (HTTP/2) or QPACK (HTTP/3), which both provide efficient header compression. The request or response line from HTTP/1 has also been replaced by several pseudo-header fields, each beginning with a colon (:).
Non-standard header fields were conventionally marked by prefixing the field name with X- but this convention was deprecated in June 2012 because of the inconveniences it caused when non-standard fields became standard.[6] An earlier restriction on use of Downgraded- was lifted in March 2013.[7]
Many field values may contain a quality (q) key-value pair separated by equals sign, specifying a weight to use in content negotiation.[9] For example, a browser may indicate that it accepts information in German or English, with German as preferred by setting the q value for de higher than that of en, as follows:
The standard imposes no limits to the size of each header field name or value, or to the number of fields. However, most servers, clients, and proxy software impose some limits for practical and security reasons. For example, the Apache 2.3 server by default limits the size of each field to 8,190 bytes, and there can be at most 100 header fields in a single request.[10]
If a web server responds with Cache-Control: no-cache then a web browser or other caching system (intermediate proxies) must not use the response to satisfy subsequent requests without first checking with the originating server (this process is called validation). This header field is part of HTTP version 1.1, and is ignored by some caches and browsers. It may be simulated by setting the Expires HTTP version 1.0 header field value to a time earlier than the response time. Notice that no-cache is not instructing the browser or proxies about whether or not to cache the content. It just tells the browser and proxies to validate the cache content with the server before using it (this is done by using If-Modified-Since, If-Unmodified-Since, If-Match, If-None-Match attributes mentioned above). Sending a no-cache value thus instructs a browser or proxy to not use the cache contents merely based on "freshness criteria" of the cache content. Another common way to prevent old content from being shown to the user without validation is Cache-Control: max-age=0. This instructs the user agent that the content is stale and should be validated before use.
The request that a resource should not be cached is no guarantee that it will not be written to disk. In particular, the HTTP/1.1 definition draws a distinction between history stores and caches. If the user navigates back to a previous page a browser may still show you a page that has been stored on disk in the history store. This is correct behavior according to the specification. Many user agents show different behavior in loading pages from the history store or cache depending on whether the protocol is HTTP or HTTPS.
The Cache-Control: no-cache HTTP/1.1 header field is also intended for use in requests made by the client. It is a means for the browser to tell the server and any intermediate caches that it wants a fresh version of the resource. The Pragma: no-cache header field, defined in the HTTP/1.0 spec, has the same purpose. It, however, is only defined for the request header. Its meaning in a response header is not specified.[76] The behavior of Pragma: no-cache in a response is implementation specific. While some user agents do pay attention to this field in responses,[77] the HTTP/1.1 RFC specifically warns against relying on this behavior.
As of this edit, this article uses content from "What is the X-REQUEST-ID http header?", authored by Stefan Kgl at Stack Exchange, which is licensed in a way that permits reuse under the Creative Commons Attribution-ShareAlike 3.0 Unported License, but not under the GFDL. All relevant terms must be followed.
As of this edit, this article uses content from "Why does ASP.NET framework add the 'X-Powered-By:ASP.NET' HTTP Header in responses?", authored by Adrian Grigore at Stack Exchange, which is licensed in a way that permits reuse under the Creative Commons Attribution-ShareAlike 3.0 Unported License, but not under the GFDL. All relevant terms must be followed.
Could you escalate this issue or assign it to someone else please? There is a knowledge gap here that I am not sure I will be able to bridge. I am not in need of a custom header or the current time at all. I am simply informing you that some CDN nodes are misconfigured, which is a violation of spec. 152ee80cbc
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