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Code Issues Releases Wiki Activity

anchor fixes

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stpeter 2011-04-13 16:48:35 -06:00
parent bae613ecae
commit c67d5df609
1 changed files with 8 additions and 8 deletions
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xep-0124.xml
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@ -266,9 +266,9 @@ Content-Length: 104
ack='1' ack='1'
xml:lang='en' xml:lang='en'
xmlns='http://jabber.org/protocol/httpbind'/>]]></example> xmlns='http://jabber.org/protocol/httpbind'/>]]></example>
<p>Note: All requests after the first one MUST include a valid 'sid' attribute (provided by the connection manager in the <link url="#session-create">Session Creation Response</link>). The initialization request is unique in that the &lt;body/&gt; element MUST NOT possess a 'sid' attribute.</p> <p>Note: All requests after the first one MUST include a valid 'sid' attribute (provided by the connection manager in the <link url="#session-response">Session Creation Response</link>). The initialization request is unique in that the &lt;body/&gt; element MUST NOT possess a 'sid' attribute.</p>
</section2> </section2>
<section2 topic="Session Creation Response" anchor='session-create'> <section2 topic="Session Creation Response" anchor='session-response'>
<p>After receiving a new session request, the connection manager MUST generate an opaque, unpredictable session identifier (or SID). The SID MUST be unique within the context of the connection manager application. The &lt;body/&gt; element of the connection manager's response to the client's session creation request MUST possess the following attributes (they SHOULD NOT be included in any other responses):</p> <p>After receiving a new session request, the connection manager MUST generate an opaque, unpredictable session identifier (or SID). The SID MUST be unique within the context of the connection manager application. The &lt;body/&gt; element of the connection manager's response to the client's session creation request MUST possess the following attributes (they SHOULD NOT be included in any other responses):</p>
<ul> <ul>
<li><strong>'sid'</strong> -- This attribute specifies the SID</li> <li><strong>'sid'</strong> -- This attribute specifies the SID</li>
@ -447,7 +447,7 @@ Content-Length: 64
<p>If the connection manager has responded to all the requests it has received within a session and the time since its last response is longer than the maximum inactivity period, then it SHOULD assume the client has been disconnected and terminate the session without informing the client. If the client subsequently makes another request, then the connection manager SHOULD respond as if the session does not exist.</p> <p>If the connection manager has responded to all the requests it has received within a session and the time since its last response is longer than the maximum inactivity period, then it SHOULD assume the client has been disconnected and terminate the session without informing the client. If the client subsequently makes another request, then the connection manager SHOULD respond as if the session does not exist.</p>
<p>If the connection manager did not specify a maximum inactivity period in the session creation response, then it SHOULD allow the client to be inactive for as long as it chooses.</p> <p>If the connection manager did not specify a maximum inactivity period in the session creation response, then it SHOULD allow the client to be inactive for as long as it chooses.</p>
<p>If the session is not a polling session then the connection manager SHOULD specify a relatively short inactivity period to ensure that disconnections are discovered as quickly as possible. The RECOMMENDED time would be a little more than the number of seconds for a comfortable network round trip between the connection manager and the client under difficult network conditions (since the client can be expected to make a new request immediately -- see above).</p> <p>If the session is not a polling session then the connection manager SHOULD specify a relatively short inactivity period to ensure that disconnections are discovered as quickly as possible. The RECOMMENDED time would be a little more than the number of seconds for a comfortable network round trip between the connection manager and the client under difficult network conditions (since the client can be expected to make a new request immediately -- see above).</p>
<p>If a client encounters an exceptional temporary situation during which it will be unable to send requests to the connection manager for a period of time greater than the maximum inactivity period (e.g., while a runtime environment changes from one web page to another), and if the connection manager included a 'maxpause' attribute in its <link url="#session-create">Session Creation Response</link>, then the client MAY request a temporary increase to the maximum inactivity period by including a 'pause' attribute in a request. Note: If the connection manager did not specify a 'maxpause' attribute at the start of the session then the client MUST NOT send a 'pause' attribute during the session.</p> <p>If a client encounters an exceptional temporary situation during which it will be unable to send requests to the connection manager for a period of time greater than the maximum inactivity period (e.g., while a runtime environment changes from one web page to another), and if the connection manager included a 'maxpause' attribute in its <link url="#session-response">Session Creation Response</link>, then the client MAY request a temporary increase to the maximum inactivity period by including a 'pause' attribute in a request. Note: If the connection manager did not specify a 'maxpause' attribute at the start of the session then the client MUST NOT send a 'pause' attribute during the session.</p>
<example caption="Requesting a Session Pause"> <example caption="Requesting a Session Pause">
<![CDATA[POST /webclient HTTP/1.1 <![CDATA[POST /webclient HTTP/1.1
Host: httpcm.example.com Host: httpcm.example.com
@ -464,7 +464,7 @@ Content-Length: 98
<p>The connection manager SHOULD set the maximum inactivity period back to normal upon reception of the next request from the client (assuming the connection manager has not already terminated the session).</p> <p>The connection manager SHOULD set the maximum inactivity period back to normal upon reception of the next request from the client (assuming the connection manager has not already terminated the session).</p>
</section1> </section1>
<section1 topic='Overactivity' anchor='overactive'> <section1 topic='Overactivity' anchor='overactive'>
<p>The client SHOULD NOT make more simultaneous requests than specified by the 'requests' attribute in the connection manager's <link url="#session-create">Session Creation Response</link>. However the client MAY make one additional request if it is to <link url="#inactive">pause</link> or <link url="#terminate">terminate</link> a session.</p> <p>The client SHOULD NOT make more simultaneous requests than specified by the 'requests' attribute in the connection manager's <link url="#session-response">Session Creation Response</link>. However the client MAY make one additional request if it is to <link url="#inactive">pause</link> or <link url="#terminate">terminate</link> a session.</p>
<p>If during any period the client sends a sequence of new requests (i.e. requests with incremented rid attributes, not repeat requests) longer than the number specified by the 'requests' attribute, and if the connection manager has not yet responded to any of the requests, and if the last request did not include either a 'pause' attribute or a 'type' attribute set to "terminate", then the connection manager SHOULD consider that the client is making too many simultaneous requests, and terminate the HTTP session with a 'policy-violation' terminal binding error to the client. Note: This behavior applies to equally to normal and polling sessions.</p> <p>If during any period the client sends a sequence of new requests (i.e. requests with incremented rid attributes, not repeat requests) longer than the number specified by the 'requests' attribute, and if the connection manager has not yet responded to any of the requests, and if the last request did not include either a 'pause' attribute or a 'type' attribute set to "terminate", then the connection manager SHOULD consider that the client is making too many simultaneous requests, and terminate the HTTP session with a 'policy-violation' terminal binding error to the client. Note: This behavior applies to equally to normal and polling sessions.</p>
<example caption="Too many simultaneous requests response"> <example caption="Too many simultaneous requests response">
<![CDATA[HTTP/1.1 200 OK <![CDATA[HTTP/1.1 200 OK
@ -487,7 +487,7 @@ Content-Length: 68
<p>Note: If the connection manager did not specify a 'polling' attribute in the session creation response, then it MUST allow the client to send requests as frequently as it chooses.</p> <p>Note: If the connection manager did not specify a 'polling' attribute in the session creation response, then it MUST allow the client to send requests as frequently as it chooses.</p>
</section1> </section1>
<section1 topic='Polling Sessions' anchor='poll'> <section1 topic='Polling Sessions' anchor='poll'>
<p>It is not always possible for a constrained client to either use HTTP Pipelining or open more than one HTTP connection with the connection manager at a time. In this case the client SHOULD inform the connection manager by setting the values of the 'wait' and/or 'hold' attributes in its session creation request to "0", and then "poll" the connection manager at regular intervals throughout the session for payloads it might have received from the server. Note: Even if the client does not request a polling session, the connection manager MAY require a client to use polling by setting the 'requests' attribute (which specifies the number of simultaneous requests the client can make) of its <link url="#session-create">Session Creation Response</link> to "1", however this is NOT RECOMMENDED.</p> <p>It is not always possible for a constrained client to either use HTTP Pipelining or open more than one HTTP connection with the connection manager at a time. In this case the client SHOULD inform the connection manager by setting the values of the 'wait' and/or 'hold' attributes in its session creation request to "0", and then "poll" the connection manager at regular intervals throughout the session for payloads it might have received from the server. Note: Even if the client does not request a polling session, the connection manager MAY require a client to use polling by setting the 'requests' attribute (which specifies the number of simultaneous requests the client can make) of its <link url="#session-response">Session Creation Response</link> to "1", however this is NOT RECOMMENDED.</p>
<p>If a session will use polling, the connection manager SHOULD specify a higher than normal value for the 'inactivity' attribute (see <link url="#inactive">Inactivity</link>) in its session creation response. The increase SHOULD be greater than the value it specifies for the 'polling' attribute.</p> <p>If a session will use polling, the connection manager SHOULD specify a higher than normal value for the 'inactivity' attribute (see <link url="#inactive">Inactivity</link>) in its session creation response. The increase SHOULD be greater than the value it specifies for the 'polling' attribute.</p>
<p>If the client sends two consecutive empty new requests (i.e. requests with incremented rid attributes, not repeat requests) within a period shorter than the number of seconds specified by the 'polling' attribute (the shortest allowable polling interval) in the session creation response, and if the connection manager's response to the first request contained no payloads, then upon reception of the second request the connection manager SHOULD terminate the HTTP session and return a 'policy-violation' terminal binding error to the client.</p> <p>If the client sends two consecutive empty new requests (i.e. requests with incremented rid attributes, not repeat requests) within a period shorter than the number of seconds specified by the 'polling' attribute (the shortest allowable polling interval) in the session creation response, and if the connection manager's response to the first request contained no payloads, then upon reception of the second request the connection manager SHOULD terminate the HTTP session and return a 'policy-violation' terminal binding error to the client.</p>
<example caption="Too frequent polling response"> <example caption="Too frequent polling response">
@ -648,7 +648,7 @@ Content-Length: 188
<p>The OPTIONAL feature described in this section enables multiple XML streams to be contained within a single HTTP session. This feature is essential in runtime environments that prevent HTTP Pipelining, thereby constraining the number of simultaneous HTTP requests a client can make to each connection manager, since clients running in such environments need multi-stream sessions if they are to connect using more than one account at the same time. This feature also reduces network traffic for any client that needs to establish parallel streams over HTTP.</p> <p>The OPTIONAL feature described in this section enables multiple XML streams to be contained within a single HTTP session. This feature is essential in runtime environments that prevent HTTP Pipelining, thereby constraining the number of simultaneous HTTP requests a client can make to each connection manager, since clients running in such environments need multi-stream sessions if they are to connect using more than one account at the same time. This feature also reduces network traffic for any client that needs to establish parallel streams over HTTP.</p>
</section2> </section2>
<section2 topic="Discovery" anchor='multi-discover'> <section2 topic="Discovery" anchor='multi-discover'>
<p>If a connection manager supports the multi-streams feature, it MUST include a 'stream' attribute in its <link url="#session-create">Session Creation Response</link>. If a client does not receive the 'stream' attribute then it MUST assume that the connection manager does not support the feature. <note>Therefore a client and a connection manager will be compatible even if one or the other offers no support for multi-stream sessions.</note></p> <p>If a connection manager supports the multi-streams feature, it MUST include a 'stream' attribute in its <link url="#session-response">Session Creation Response</link>. If a client does not receive the 'stream' attribute then it MUST assume that the connection manager does not support the feature. <note>Therefore a client and a connection manager will be compatible even if one or the other offers no support for multi-stream sessions.</note></p>
<p>The 'stream' attribute identifies the first stream to be opened for the session. The value of each 'stream' attribute MUST be an opaque and unpredictable name that is unique within the context of the connection manager application.</p> <p>The 'stream' attribute identifies the first stream to be opened for the session. The value of each 'stream' attribute MUST be an opaque and unpredictable name that is unique within the context of the connection manager application.</p>
<example caption="Session creation response with stream name"> <example caption="Session creation response with stream name">
<![CDATA[HTTP/1.1 200 OK <![CDATA[HTTP/1.1 200 OK
@ -684,7 +684,7 @@ Content-Length: 104
route='xmpp:example.com:9999' route='xmpp:example.com:9999'
xml:lang='en' xml:lang='en'
xmlns='http://jabber.org/protocol/httpbind'/>]]></example> xmlns='http://jabber.org/protocol/httpbind'/>]]></example>
<p>If the connection manager did not indicate its support for multiple streams at the start of the session, then it MUST ignore the extra attributes and treat the request as a normal empty request for payloads (see <link url="#payloads">Sending and Receiving XML Payloads</link>). <note>This helps to ensure backwards-compatibility with older implementations.</note> Otherwise it MUST open a new stream with the specified server (see <link url="#session-create">Session Creation Response</link>), generate a new stream name, and respond to the client with the name. The response MAY also include 'from' and 'secure' attributes, but it SHOULD NOT include 'sid', 'requests', 'polling', 'hold', 'inactivity', 'maxpause', 'accept', 'charsets', 'ver' or 'wait' attributes.</p> <p>If the connection manager did not indicate its support for multiple streams at the start of the session, then it MUST ignore the extra attributes and treat the request as a normal empty request for payloads (see <link url="#payloads">Sending and Receiving XML Payloads</link>). <note>This helps to ensure backwards-compatibility with older implementations.</note> Otherwise it MUST open a new stream with the specified server (see <link url="#session-response">Session Creation Response</link>), generate a new stream name, and respond to the client with the name. The response MAY also include 'from' and 'secure' attributes, but it SHOULD NOT include 'sid', 'requests', 'polling', 'hold', 'inactivity', 'maxpause', 'accept', 'charsets', 'ver' or 'wait' attributes.</p>
<example caption="Add stream response"> <example caption="Add stream response">
<![CDATA[HTTP/1.1 200 OK <![CDATA[HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8 Content-Type: text/xml; charset=utf-8
@ -693,7 +693,7 @@ Content-Length: 128
<body stream='secondStreamName' <body stream='secondStreamName'
from='example.com' from='example.com'
xmlns='http://jabber.org/protocol/httpbind'/>]]></example> xmlns='http://jabber.org/protocol/httpbind'/>]]></example>
<p>Note: If the response did not include either 'from' or 'secure' attributes then they MAY be sent in a subsequent response instead (see <link url="#session-create">Session Creation Response</link>). In that case the 'stream' attribute MUST also be specified.</p> <p>Note: If the response did not include either 'from' or 'secure' attributes then they MAY be sent in a subsequent response instead (see <link url="#session-response">Session Creation Response</link>). In that case the 'stream' attribute MUST also be specified.</p>
</section2> </section2>
<section2 topic="Transmitting Payloads" anchor='multi-transmit'> <section2 topic="Transmitting Payloads" anchor='multi-transmit'>
<p>If more than one stream has been opened within a session, then all non-empty &lt;body/&gt; elements sent by the connection manager MUST include a 'stream' attribute that specifies which stream <em>all</em> the payloads it contains belong to. The client SHOULD include a 'stream' attribute for the same purpose. The client MAY omit the 'stream' attribute if it wants the connection manager to broadcast the payloads over all open streams. Note: A &lt;body/&gt; element MUST NOT contain different payloads for different streams.</p> <p>If more than one stream has been opened within a session, then all non-empty &lt;body/&gt; elements sent by the connection manager MUST include a 'stream' attribute that specifies which stream <em>all</em> the payloads it contains belong to. The client SHOULD include a 'stream' attribute for the same purpose. The client MAY omit the 'stream' attribute if it wants the connection manager to broadcast the payloads over all open streams. Note: A &lt;body/&gt; element MUST NOT contain different payloads for different streams.</p>