Accept-Charset - HTTP
in early versions of http/1.1, a default character encoding was defined: iso-8859-1. ...
...response header, usually in a charset= parameter. browsers usually don't send this header, as the default value for each resource is usually correct and transmitting it would allow fingerprinting. if the server cannot serve any character encoding from this request header, it can theoretically send back a 406 not acceptable error code. ...
...s rarely done and the accept-charset header is ignored. in early versions of http/1.1, a default character encoding was defined: iso-8859-1. this is no longer recommended, and now each content-type may have its own default. utf-8 is now well-supported and the overwhelmingly preferred character encoding. to guarantee better privacy through less configuration-based entropy, all browsers omit the accept-charset header: internet explorer 8+, safari 5+, opera 11+, firefox 10+ and chrome 27+ no longer send it. header type request header forbidden header name yes syntax accept-charset: <charset> // multiple types, weighted with the quality value syntax: accept-charset: utf-8, iso-8859-1;q=0.5 directives <charset> a character encoding name, like utf-8 or iso-8859-15. ...
...And 4 more matches

Content negotiation - HTTP
th the url. these headers describe the preferred choice of the user. the server uses them as hints and an internal algorithm chooses the best content to serve to the client. the algorithm is server-specific and not defined in the standard. see, for example, the apache negotiation algorithm. the http/1.1 standard defines list of the standard headers that start server-driven negotiation (accept, accept-charset, accept-encoding, accept-language). though strictly speaking user-agent is not in this list, it is sometimes also used to send a specific representation of the requested resource, though this is not considered as a good practice. the server uses the vary header to indicate which headers it actually used for content negotiation (or more precisely the associated response headers), so that caches ca...
...mation given by rounding to the nearest power of 2 and dividing that number by 1024. for example, 512 megabytes will be reported as 0.5. dpr indicates the client's device pixel ratio. viewport-width indicates the layout viewport width in css pixels. width indicates the resource width in physical pixels (in other words the intrinsic size of an image). the accept-charset header the accept-charset header indicates to the server what kinds of character encodings are understood by the user-agent. traditionally, it was set to a different value for each locale for the browser, like iso-8859-1,utf-8;q=0.7,*;q=0.7 for a western european locale. with utf-8 now being well-supported, being the preferred way of encoding characters, and to guarantee better privacy through ...
...server what kinds of character encodings are understood by the user-agent. traditionally, it was set to a different value for each locale for the browser, like iso-8859-1,utf-8;q=0.7,*;q=0.7 for a western european locale. with utf-8 now being well-supported, being the preferred way of encoding characters, and to guarantee better privacy through less configuration-based entropy, browsers omit the accept-charset header: internet explorer 8, safari 5, opera 11, firefox 10 and chrome 27 have abandoned this header. the accept-ch-lifetime header this is part of an experimental technology called client hints and is only available in chrome 61 or later. the accept-ch-lifetime header is used with the device-memory value of the accept-ch header and indicates the amount of time the device should opt-in to sh...

Client-Server Overview - Learn web development
the target ...
... for managing sessions (cookie: sessionid=6ynxs23n521lu21b1t136rhbv7ezngie; ...). the remaining lines contain information about the browser used and the sort of responses it can handle. for example, you can see here that: my browser (user-agent) is mozilla firefox (mozilla/5.0). it can accept gzip compressed information (accept-encoding: gzip). it can accept the specified set of characters (accept-charset: iso-8859-1,utf-8;q=0.7,*;q=0.7) and languages (accept-language: de,en;q=0.7,en-us;q=0.3). the referer line indicates the address of the web page that contained the link to this resource (i.e. the origin of the request, https://developer.mozilla.org/). http requests can also have a body, but it is empty in this case. the response the first part of the response for this request is shown below...

Forbidden header name - MDN Web Docs Glossary: Definitions of Web-related terms
name (in contrast with a forbidden response header name). modifying such headers is forbidden because the user agent retains full control over them. names starting with `sec-` are reserved for creating new headers safe from apis using fetch that grant developers control over headers, such as xmlhttprequest. ...

Quality values - MDN Web Docs Glossary: Definitions of Web-related terms
dditional specifiers like text/html;level=1. these increase the specificity of the value. their use is extremely rare. browser-specific information firefox starting with firefox 18, the quality factor values are clamped to 2 decimal places. they used to be clamped to only 1 decimal place in earlier versions (bug 672448). more information http headers using q-values in their syntax: accept, accept-charset, accept-language, accept-encoding, te. ...

HTMLFormElement - Web APIs
processes the information submitted by the form. htmlformelement.encoding or htmlformelement.enctype a domstring reflecting the value of the form's enctype html attribute, indicating the type of content that is used to transmit the form to the server. only specified values can be set. the two properties are synonyms. htmlformelement.acceptcharset a domstring reflecting the value of the form's accept-charset html attribute, representing the character encoding that the server accepts. htmlformelement.autocomplete a domstring reflecting the value of the form's autocomplete html attribute, indicating whether the controls in this form can have their values automatically populated by the browser. htmlformelement.novalidate a boolean reflecting the value of the form's novalidate html attribute, indicat...

Headers() - Web APIs
eader to this using headers.append: myheaders.append('content-type', 'image/jpeg'); myheaders.get('content-type'); // returns 'image/jpeg' or you can add the headers you want as the headers object is created. ...

Localizations and character encodings - Developer guides
central and eastern european locales, middle eastern locales and east asian locales. in order to avoid the problem of web authors creating new utf-8 content without declaring that the content uses utf-8 and in order to maximize the ability of users to read content cross-locale, do not set the fallback encoding to utf-8 for any newly-introduced localization. note that firefox no longer sends the accept-charset http header, so there is no need to consider what gets advertised in accept-charset when setting the fallback encoding. for locales where the fallback encoding is currently iso-8859-1, it should be changed to windows-1252. iso-8859-1 is decoded in the exact same way as windows-1252, but firefox is moving to treating windows-1252 as the preferred label for this encoding in accordance with the enc...

HTML attribute reference - HTML: Hypertext Markup Language
elements in html have attributes; these are additional values that configure the elements or adjust their behavior in various ways to meet the criteria the users want. attribute list attribute name elements description accept <form>, <input> list of types the server accepts, typically a file type. accept-charset <form> list of supported charsets. accesskey global attribute keyboard shortcut to activate or add focus to the element. action <form> the uri of a program that processes the information submitted via the form. align <applet>, <caption>, <col>, <colgroup>, <hr>, <iframe>, <img>, <table>, <tbody>, <td>, <tfoot> , <th>, <thead>, <tr> specifies the horizontal alignment of the element. allow ...

<form> - HTML: Hypertext Markup Language
e name, otherwise no corresponding role permitted aria roles search, none or presentation dom interface htmlformelement attributes this element includes the global attributes. accept comma-separated content types the server accepts. this attribute was removed in html5 and should not be used. instead, use the accept attribute on <input type=file> elements. accept-charset space-separated character encodings the server accepts. the browser uses them in the order in which they are listed. the default value means the same encoding as the page. (in previous versions of html, character encodings could also be delimited by commas.) autocapitalize a nonstandard attribute used by ios safari that controls how textual form elements should be automatically capitalized.

Index - HTTP
understand. using content negotiation, the server then selects one of the proposals, uses it and informs the client of its choice with the content-type response header. browsers set adequate values for this header depending on the context where the request is done: when fetching a css stylesheet a different value is set for the request than when fetching an image, video or a script. 3 accept-charset content negotiation, http, http header, reference, request header the accept-charset request http header advertises which character set the client is able to understand. using content negotiation, the server then selects one of the proposals, uses it and informs the client of its choice within the content-type response header. browsers usually don't set this header as the default value ...

HTTP headers - HTTP
whether a cached response can be used rather than requesting a fresh one from the origin server. connection management connection controls whether the network connection stays open after the current transaction finishes. keep-alive controls how long a persistent connection should stay open. content negotiation accept informs the server about the types of data that can be sent back. accept-charset which character encodings the client understands. accept-encoding the encoding algorithm, usually a compression algorithm, that can be used on the resource sent back. accept-language informs the server about the human language the server is expected to send back. this is a hint and is not necessarily under the full control of the user: the server should always pay attention not to override a...

HTTP Index - HTTP
cept-ch header is set by the server to specify which client hints headers client should include in subsequent requests. 49 accept-ch-lifetime client hints, http, header the accept-ch-lifetime header is set by the server to specify the persistence of accept-ch header value that specifies for which client hints headers client should include in subsequent requests. 50 accept-charset content negotiation, http, http header, reference, request header the accept-charset request http header advertises which character encodings the client understands. 51 accept-encoding content negotiation, http, http header, reference, request header the accept-encoding request http header advertises which content encoding, usually a compression algorithm, the clien...

406 Not Acceptable - HTTP
the hypertext transfer protocol (http) 406 not acceptable client error response code indicates that the server cannot produce a response matching the list of acceptable values defined in the request's proactive content negotiation headers, and that the server is unwilling to supply a default representation. proactive content negotiation headers include: accept accept-charset accept-encoding accept-language in practice, this error is very rarely used. instead of responding using this error code, which would be cryptic for the end user and difficult to fix, servers ignore the relevant header and serve an actual page to the user. it is assumed that even if the user won't be completely happy, they will prefer this to an error code. if a server returns such an error status, the body of the message...