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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIChannel.idl"
+
+interface nsIHttpHeaderVisitor;
+
+/**
+ * nsIHttpChannel
+ *
+ * This interface allows for the modification of HTTP request parameters and
+ * the inspection of the resulting HTTP response status and headers when they
+ * become available.
+ */
+[builtinclass, scriptable, uuid(c5a4a073-4539-49c7-a3f2-cec3f0619c6c)]
+interface nsIHttpChannel : nsIChannel
+{
+ /**************************************************************************
+ * REQUEST CONFIGURATION
+ *
+ * Modifying request parameters after asyncOpen has been called is an error.
+ */
+
+ /**
+ * Set/get the HTTP request method (default is "GET"). Both setter and
+ * getter are case sensitive.
+ *
+ * This attribute may only be set before the channel is opened.
+ *
+ * NOTE: The data for a "POST" or "PUT" request can be configured via
+ * nsIUploadChannel; however, after setting the upload data, it may be
+ * necessary to set the request method explicitly. The documentation
+ * for nsIUploadChannel has further details.
+ *
+ * @throws NS_ERROR_IN_PROGRESS if set after the channel has been opened.
+ */
+ attribute ACString requestMethod;
+
+ /**
+ * Get/set the HTTP referrer URI. This is the address (URI) of the
+ * resource from which this channel's URI was obtained (see RFC2616 section
+ * 14.36).
+ *
+ * This attribute may only be set before the channel is opened.
+ *
+ * NOTE: The channel may silently refuse to set the Referer header if the
+ * URI does not pass certain security checks (e.g., a "https://" URL will
+ * never be sent as the referrer for a plaintext HTTP request). The
+ * implementation is not required to throw an exception when the referrer
+ * URI is rejected.
+ *
+ * @throws NS_ERROR_IN_PROGRESS if set after the channel has been opened.
+ * @throws NS_ERROR_FAILURE if used for setting referrer during
+ * visitRequestHeaders. Getting the value will not throw.
+ */
+ attribute nsIURI referrer;
+
+ /**
+ * Referrer policies. See ReferrerPolicy.h for more details.
+ */
+
+
+ /* The undefined state, usually used to check the need of
+ overruling document-wide referrer policy. */
+ const unsigned long REFERRER_POLICY_UNSET = 4294967295; // UINT32_MAX
+
+ /* default state, a shorter name for no-referrer-when-downgrade */
+ const unsigned long REFERRER_POLICY_DEFAULT = 0;
+ /* default state, doesn't send referrer from https->http */
+ const unsigned long REFERRER_POLICY_NO_REFERRER_WHEN_DOWNGRADE = 0;
+ /* sends no referrer */
+ const unsigned long REFERRER_POLICY_NO_REFERRER = 1;
+ /* only sends the origin of the referring URL */
+ const unsigned long REFERRER_POLICY_ORIGIN = 2;
+ /* same as default, but reduced to ORIGIN when cross-origin. */
+ const unsigned long REFERRER_POLICY_ORIGIN_WHEN_XORIGIN = 3;
+ /* always sends the referrer, even on downgrade. */
+ const unsigned long REFERRER_POLICY_UNSAFE_URL = 4;
+ /* send referrer when same-origin, no referrer when cross-origin */
+ const unsigned long REFERRER_POLICY_SAME_ORIGIN = 5;
+ /* send origin when request from https->https or http->http(s)
+ No referrer when request from https->http. */
+ const unsigned long REFERRER_POLICY_STRICT_ORIGIN = 6;
+ /* send referrer when same-origin,
+ Send origin when cross-origin from https->https or http->http(s)
+ No referrer when request from https->http. */
+ const unsigned long REFERRER_POLICY_STRICT_ORIGIN_WHEN_XORIGIN = 7;
+
+ /**
+ * Get the HTTP referrer policy. The policy is retrieved from the meta
+ * referrer tag, which can be one of many values (see ReferrerPolicy.h for
+ * more details).
+ */
+ readonly attribute unsigned long referrerPolicy;
+
+ /**
+ * Set the HTTP referrer URI with a referrer policy.
+ * @throws NS_ERROR_FAILURE if called during visitRequestHeaders.
+ */
+ void setReferrerWithPolicy(in nsIURI referrer, in unsigned long referrerPolicy);
+
+ /**
+ * Returns the network protocol used to fetch the resource as identified
+ * by the ALPN Protocol ID.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ */
+ readonly attribute ACString protocolVersion;
+
+ /**
+ * size consumed by the response header fields and the response payload body
+ */
+ readonly attribute uint64_t transferSize;
+
+ /**
+ * The size of the message body received by the client,
+ * after removing any applied content-codings
+ */
+ readonly attribute uint64_t decodedBodySize;
+
+ /**
+ * The size in octets of the payload body, prior to removing content-codings
+ */
+ readonly attribute uint64_t encodedBodySize;
+
+ /**
+ * Get the value of a particular request header.
+ *
+ * @param aHeader
+ * The case-insensitive name of the request header to query (e.g.,
+ * "Cache-Control").
+ *
+ * @return the value of the request header.
+ * @throws NS_ERROR_NOT_AVAILABLE if the header is not set.
+ */
+ ACString getRequestHeader(in ACString aHeader);
+
+ /**
+ * Set the value of a particular request header.
+ *
+ * This method allows, for example, the cookies module to add "Cookie"
+ * headers to the outgoing HTTP request.
+ *
+ * This method may only be called before the channel is opened.
+ *
+ * @param aHeader
+ * The case-insensitive name of the request header to set (e.g.,
+ * "Cookie").
+ * @param aValue
+ * The request header value to set (e.g., "X=1").
+ * @param aMerge
+ * If true, the new header value will be merged with any existing
+ * values for the specified header. This flag is ignored if the
+ * specified header does not support merging (e.g., the "Content-
+ * Type" header can only have one value). The list of headers for
+ * which this flag is ignored is an implementation detail. If this
+ * flag is false, then the header value will be replaced with the
+ * contents of |aValue|.
+ *
+ * If aValue is empty and aMerge is false, the header will be cleared.
+ *
+ * @throws NS_ERROR_IN_PROGRESS if called after the channel has been
+ * opened.
+ * @throws NS_ERROR_FAILURE if called during visitRequestHeaders.
+ */
+ void setRequestHeader(in ACString aHeader,
+ in ACString aValue,
+ in boolean aMerge);
+
+ /**
+ * Set a request header with empty value.
+ *
+ * This should be used with caution in the cases where the behavior of
+ * setRequestHeader ignoring empty header values is undesirable.
+ *
+ * This method may only be called before the channel is opened.
+ *
+ * @param aHeader
+ * The case-insensitive name of the request header to set (e.g.,
+ * "Cookie").
+ *
+ * @throws NS_ERROR_IN_PROGRESS if called after the channel has been
+ * opened.
+ * @throws NS_ERROR_FAILURE if called during visitRequestHeaders.
+ */
+ void setEmptyRequestHeader(in ACString aHeader);
+
+ /**
+ * Call this method to visit all request headers. Calling setRequestHeader
+ * while visiting request headers has undefined behavior. Don't do it!
+ *
+ * @param aVisitor
+ * the header visitor instance.
+ */
+ void visitRequestHeaders(in nsIHttpHeaderVisitor aVisitor);
+
+ /**
+ * Call this method to visit all non-default (UA-provided) request headers.
+ * Calling setRequestHeader while visiting request headers has undefined
+ * behavior. Don't do it!
+ *
+ * @param aVisitor
+ * the header visitor instance.
+ */
+ void visitNonDefaultRequestHeaders(in nsIHttpHeaderVisitor aVisitor);
+
+ /**
+ * This attribute is a hint to the channel to indicate whether or not
+ * the underlying HTTP transaction should be allowed to be pipelined
+ * with other transactions. This should be set to FALSE, for example,
+ * if the application knows that the corresponding document is likely
+ * to be very large.
+ *
+ * This attribute is true by default, though other factors may prevent
+ * pipelining.
+ *
+ * This attribute may only be set before the channel is opened.
+ *
+ * @throws NS_ERROR_FAILURE if set after the channel has been opened.
+ */
+ attribute boolean allowPipelining;
+
+ /**
+ * This attribute of the channel indicates whether or not
+ * the underlying HTTP transaction should be honor stored Strict Transport
+ * Security directives for its principal. It defaults to true. Using
+ * OCSP to bootstrap the HTTPs is the likely use case for setting it to
+ * false.
+ *
+ * This attribute may only be set before the channel is opened.
+ *
+ * @throws NS_ERROR_IN_PROGRESS or NS_ERROR_ALREADY_OPENED
+ * if called after the channel has been opened.
+ */
+ attribute boolean allowSTS;
+
+ /**
+ * This attribute specifies the number of redirects this channel is allowed
+ * to make. If zero, the channel will fail to redirect and will generate
+ * a NS_ERROR_REDIRECT_LOOP failure status.
+ *
+ * NOTE: An HTTP redirect results in a new channel being created. If the
+ * new channel supports nsIHttpChannel, then it will be assigned a value
+ * to its |redirectionLimit| attribute one less than the value of the
+ * redirected channel's |redirectionLimit| attribute. The initial value
+ * for this attribute may be a configurable preference (depending on the
+ * implementation).
+ */
+ attribute unsigned long redirectionLimit;
+
+
+ /**************************************************************************
+ * RESPONSE INFO
+ *
+ * Accessing response info before the onStartRequest event is an error.
+ */
+
+ /**
+ * Get the HTTP response code (e.g., 200).
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ */
+ readonly attribute unsigned long responseStatus;
+
+ /**
+ * Get the HTTP response status text (e.g., "OK").
+ *
+ * NOTE: This returns the raw (possibly 8-bit) text from the server. There
+ * are no assumptions made about the charset of the returned text. You
+ * have been warned!
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ */
+ readonly attribute ACString responseStatusText;
+
+ /**
+ * Returns true if the HTTP response code indicates success. The value of
+ * nsIRequest::status will be NS_OK even when processing a 404 response
+ * because a 404 response may include a message body that (in some cases)
+ * should be shown to the user.
+ *
+ * Use this attribute to distinguish server error pages from normal pages,
+ * instead of comparing the response status manually against the set of
+ * valid response codes, if that is required by your application.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ */
+ readonly attribute boolean requestSucceeded;
+
+ /** Indicates whether channel should be treated as the main one for the
+ * current document. If manually set to true, will always remain true. Otherwise,
+ * will be true iff LOAD_DOCUMENT_URI is set in the channel's loadflags.
+ */
+ attribute boolean isMainDocumentChannel;
+
+ /**
+ * Get the value of a particular response header.
+ *
+ * @param aHeader
+ * The case-insensitive name of the response header to query (e.g.,
+ * "Set-Cookie").
+ *
+ * @return the value of the response header.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest) or if the header is
+ * not set in the response.
+ */
+ ACString getResponseHeader(in ACString header);
+
+ /**
+ * Set the value of a particular response header.
+ *
+ * This method allows, for example, the HTML content sink to inform the HTTP
+ * channel about HTTP-EQUIV headers found in HTML <META> tags.
+ *
+ * @param aHeader
+ * The case-insensitive name of the response header to set (e.g.,
+ * "Cache-control").
+ * @param aValue
+ * The response header value to set (e.g., "no-cache").
+ * @param aMerge
+ * If true, the new header value will be merged with any existing
+ * values for the specified header. This flag is ignored if the
+ * specified header does not support merging (e.g., the "Content-
+ * Type" header can only have one value). The list of headers for
+ * which this flag is ignored is an implementation detail. If this
+ * flag is false, then the header value will be replaced with the
+ * contents of |aValue|.
+ *
+ * If aValue is empty and aMerge is false, the header will be cleared.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ * @throws NS_ERROR_ILLEGAL_VALUE if changing the value of this response
+ * header is not allowed.
+ * @throws NS_ERROR_FAILURE if called during visitResponseHeaders,
+ * VisitOriginalResponseHeaders or getOriginalResponseHeader.
+ */
+ void setResponseHeader(in ACString header,
+ in ACString value,
+ in boolean merge);
+
+ /**
+ * Call this method to visit all response headers. Calling
+ * setResponseHeader while visiting response headers has undefined
+ * behavior. Don't do it!
+ *
+ * @param aVisitor
+ * the header visitor instance.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ */
+ void visitResponseHeaders(in nsIHttpHeaderVisitor aVisitor);
+
+ /**
+ * Get the value(s) of a particular response header in the form and order
+ * it has been received from the remote peer. There can be multiple headers
+ * with the same name.
+ *
+ * @param aHeader
+ * The case-insensitive name of the response header to query (e.g.,
+ * "Set-Cookie").
+ *
+ * @param aVisitor
+ * the header visitor instance.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest) or if the header is
+ * not set in the response.
+ */
+ void getOriginalResponseHeader(in ACString aHeader,
+ in nsIHttpHeaderVisitor aVisitor);
+
+ /**
+ * Call this method to visit all response headers in the form and order as
+ * they have been received from the remote peer.
+ * Calling setResponseHeader while visiting response headers has undefined
+ * behavior. Don't do it!
+ *
+ * @param aVisitor
+ * the header visitor instance.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ */
+ void visitOriginalResponseHeaders(in nsIHttpHeaderVisitor aVisitor);
+
+ /**
+ * Returns true if the server sent a "Cache-Control: no-store" response
+ * header.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ */
+ boolean isNoStoreResponse();
+
+ /**
+ * Returns true if the server sent the equivalent of a "Cache-control:
+ * no-cache" response header. Equivalent response headers include:
+ * "Pragma: no-cache", "Expires: 0", and "Expires" with a date value
+ * in the past relative to the value of the "Date" header.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ */
+ boolean isNoCacheResponse();
+
+ /**
+ * Returns true if the server sent a "Cache-Control: private" response
+ * header.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called before the response
+ * has been received (before onStartRequest).
+ */
+ boolean isPrivateResponse();
+
+ /**
+ * Instructs the channel to immediately redirect to a new destination.
+ * Can only be called on channels that have not yet called their
+ * listener's OnStartRequest(). Generally that means the latest time
+ * this can be used is one of:
+ * "http-on-examine-response"
+ * "http-on-examine-merged-response"
+ * "http-on-examine-cached-response"
+ *
+ * When non-null URL is set before AsyncOpen:
+ * we attempt to redirect to the targetURI before we even start building
+ * and sending the request to the cache or the origin server.
+ * If the redirect is vetoed, we fail the channel.
+ *
+ * When set between AsyncOpen and first call to OnStartRequest being called:
+ * we attempt to redirect before we start delivery of network or cached
+ * response to the listener. If vetoed, we continue with delivery of
+ * the original content to the channel listener.
+ *
+ * When passed aTargetURI is null the channel behaves normally (can be
+ * rewritten).
+ *
+ * This method provides no explicit conflict resolution. The last
+ * caller to call it wins.
+ *
+ * @throws NS_ERROR_NOT_AVAILABLE if called after the channel has already
+ * started to deliver the content to its listener.
+ */
+ void redirectTo(in nsIURI aTargetURI);
+
+ /**
+ * Identifies the request context for this load.
+ */
+ [noscript] attribute nsID requestContextID;
+
+ /**
+ * Unique ID of the channel, shared between parent and child. Needed if
+ * the channel activity needs to be monitored across process boundaries,
+ * like in devtools net monitor. See bug 1274556.
+ */
+ attribute ACString channelId;
+
+ /**
+ * ID of the top-level document's inner window. Identifies the content
+ * this channels is being load in.
+ */
+ attribute uint64_t topLevelContentWindowId;
+};