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273 lines
10 KiB
Plaintext
273 lines
10 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsIChannel.idl"
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interface nsIHttpHeaderVisitor;
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/**
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* nsIHttpChannel
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*
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* This interface allows for the modification of HTTP request parameters and
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* the inspection of the resulting HTTP response status and headers when they
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* become available.
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*/
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[scriptable, uuid(a01362a0-5c45-11e2-bcfd-0800200c9a66)]
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interface nsIHttpChannel : nsIChannel
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{
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/**************************************************************************
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* REQUEST CONFIGURATION
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*
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* Modifying request parameters after asyncOpen has been called is an error.
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*/
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/**
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* Set/get the HTTP request method (default is "GET"). Setter is case
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* insensitive; getter returns an uppercase string.
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*
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* This attribute may only be set before the channel is opened.
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*
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* NOTE: The data for a "POST" or "PUT" request can be configured via
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* nsIUploadChannel; however, after setting the upload data, it may be
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* necessary to set the request method explicitly. The documentation
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* for nsIUploadChannel has further details.
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*
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* @throws NS_ERROR_IN_PROGRESS if set after the channel has been opened.
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*/
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attribute ACString requestMethod;
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/**
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* Get/set the HTTP referrer URI. This is the address (URI) of the
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* resource from which this channel's URI was obtained (see RFC2616 section
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* 14.36).
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*
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* This attribute may only be set before the channel is opened.
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*
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* NOTE: The channel may silently refuse to set the Referer header if the
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* URI does not pass certain security checks (e.g., a "https://" URL will
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* never be sent as the referrer for a plaintext HTTP request). The
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* implementation is not required to throw an exception when the referrer
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* URI is rejected.
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*
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* @throws NS_ERROR_IN_PROGRESS if set after the channel has been opened.
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*/
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attribute nsIURI referrer;
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/**
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* Get the value of a particular request header.
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*
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* @param aHeader
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* The case-insensitive name of the request header to query (e.g.,
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* "Cache-Control").
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*
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* @return the value of the request header.
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* @throws NS_ERROR_NOT_AVAILABLE if the header is not set.
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*/
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ACString getRequestHeader(in ACString aHeader);
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/**
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* Set the value of a particular request header.
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*
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* This method allows, for example, the cookies module to add "Cookie"
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* headers to the outgoing HTTP request.
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*
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* This method may only be called before the channel is opened.
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*
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* @param aHeader
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* The case-insensitive name of the request header to set (e.g.,
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* "Cookie").
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* @param aValue
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* The request header value to set (e.g., "X=1").
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* @param aMerge
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* If true, the new header value will be merged with any existing
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* values for the specified header. This flag is ignored if the
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* specified header does not support merging (e.g., the "Content-
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* Type" header can only have one value). The list of headers for
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* which this flag is ignored is an implementation detail. If this
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* flag is false, then the header value will be replaced with the
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* contents of |aValue|.
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*
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* If aValue is empty and aMerge is false, the header will be cleared.
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*
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* @throws NS_ERROR_IN_PROGRESS if called after the channel has been
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* opened.
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*/
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void setRequestHeader(in ACString aHeader,
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in ACString aValue,
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in boolean aMerge);
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/**
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* Call this method to visit all request headers. Calling setRequestHeader
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* while visiting request headers has undefined behavior. Don't do it!
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*
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* @param aVisitor
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* the header visitor instance.
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*/
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void visitRequestHeaders(in nsIHttpHeaderVisitor aVisitor);
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/**
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* This attribute is a hint to the channel to indicate whether or not
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* the underlying HTTP transaction should be allowed to be pipelined
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* with other transactions. This should be set to FALSE, for example,
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* if the application knows that the corresponding document is likely
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* to be very large.
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*
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* This attribute is true by default, though other factors may prevent
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* pipelining.
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*
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* This attribute may only be set before the channel is opened.
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*
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* @throws NS_ERROR_FAILURE if set after the channel has been opened.
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*/
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attribute boolean allowPipelining;
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/**
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* This attribute specifies the number of redirects this channel is allowed
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* to make. If zero, the channel will fail to redirect and will generate
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* a NS_ERROR_REDIRECT_LOOP failure status.
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*
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* NOTE: An HTTP redirect results in a new channel being created. If the
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* new channel supports nsIHttpChannel, then it will be assigned a value
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* to its |redirectionLimit| attribute one less than the value of the
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* redirected channel's |redirectionLimit| attribute. The initial value
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* for this attribute may be a configurable preference (depending on the
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* implementation).
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*/
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attribute unsigned long redirectionLimit;
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/**************************************************************************
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* RESPONSE INFO
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*
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* Accessing response info before the onStartRequest event is an error.
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*/
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/**
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* Get the HTTP response code (e.g., 200).
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*
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* @throws NS_ERROR_NOT_AVAILABLE if called before the response
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* has been received (before onStartRequest).
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*/
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readonly attribute unsigned long responseStatus;
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/**
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* Get the HTTP response status text (e.g., "OK").
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*
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* NOTE: This returns the raw (possibly 8-bit) text from the server. There
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* are no assumptions made about the charset of the returned text. You
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* have been warned!
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*
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* @throws NS_ERROR_NOT_AVAILABLE if called before the response
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* has been received (before onStartRequest).
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*/
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readonly attribute ACString responseStatusText;
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/**
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* Returns true if the HTTP response code indicates success. The value of
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* nsIRequest::status will be NS_OK even when processing a 404 response
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* because a 404 response may include a message body that (in some cases)
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* should be shown to the user.
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*
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* Use this attribute to distinguish server error pages from normal pages,
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* instead of comparing the response status manually against the set of
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* valid response codes, if that is required by your application.
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*
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* @throws NS_ERROR_NOT_AVAILABLE if called before the response
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* has been received (before onStartRequest).
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*/
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readonly attribute boolean requestSucceeded;
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/**
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* Get the value of a particular response header.
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*
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* @param aHeader
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* The case-insensitive name of the response header to query (e.g.,
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* "Set-Cookie").
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*
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* @return the value of the response header.
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*
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* @throws NS_ERROR_NOT_AVAILABLE if called before the response
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* has been received (before onStartRequest) or if the header is
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* not set in the response.
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*/
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ACString getResponseHeader(in ACString header);
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/**
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* Set the value of a particular response header.
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*
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* This method allows, for example, the HTML content sink to inform the HTTP
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* channel about HTTP-EQUIV headers found in HTML <META> tags.
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*
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* @param aHeader
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* The case-insensitive name of the response header to set (e.g.,
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* "Cache-control").
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* @param aValue
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* The response header value to set (e.g., "no-cache").
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* @param aMerge
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* If true, the new header value will be merged with any existing
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* values for the specified header. This flag is ignored if the
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* specified header does not support merging (e.g., the "Content-
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* Type" header can only have one value). The list of headers for
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* which this flag is ignored is an implementation detail. If this
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* flag is false, then the header value will be replaced with the
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* contents of |aValue|.
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*
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* If aValue is empty and aMerge is false, the header will be cleared.
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*
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* @throws NS_ERROR_NOT_AVAILABLE if called before the response
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* has been received (before onStartRequest).
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* @throws NS_ERROR_ILLEGAL_VALUE if changing the value of this response
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* header is not allowed.
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*/
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void setResponseHeader(in ACString header,
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in ACString value,
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in boolean merge);
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/**
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* Call this method to visit all response headers. Calling
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* setResponseHeader while visiting response headers has undefined
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* behavior. Don't do it!
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*
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* @param aVisitor
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* the header visitor instance.
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*
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* @throws NS_ERROR_NOT_AVAILABLE if called before the response
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* has been received (before onStartRequest).
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*/
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void visitResponseHeaders(in nsIHttpHeaderVisitor aVisitor);
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/**
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* Returns true if the server sent a "Cache-Control: no-store" response
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* header.
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*
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* @throws NS_ERROR_NOT_AVAILABLE if called before the response
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* has been received (before onStartRequest).
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*/
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boolean isNoStoreResponse();
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/**
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* Returns true if the server sent the equivalent of a "Cache-control:
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* no-cache" response header. Equivalent response headers include:
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* "Pragma: no-cache", "Expires: 0", and "Expires" with a date value
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* in the past relative to the value of the "Date" header.
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*
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* @throws NS_ERROR_NOT_AVAILABLE if called before the response
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* has been received (before onStartRequest).
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*/
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boolean isNoCacheResponse();
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/**
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* Instructs the channel to immediately redirect to a new destination.
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* Can only be called on channels not yet opened.
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*
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* This method provides no explicit conflict resolution. The last
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* caller to call it wins.
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*
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* @throws NS_ERROR_ALREADY_OPENED if called after the channel
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* has been opened.
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*/
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void redirectTo(in nsIURI aNewURI);
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};
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