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<p>Modifies the ack deadline for a specific message. This method is useful to indicate that more time is needed to process a message by the subscriber, or to make the message available for redelivery if the processing was interrupted. Note that this does not modify the subscription-level <code>ackDeadlineSeconds</code> used for subsequent messages.</p>
<h1 id="scopes">Scopes</h1>
<p>You will need authorization for at least one of the following scopes to make a valid call:</p>
<ul>
<li><em>https://www.googleapis.com/auth/cloud-platform</em></li>
<li><em>https://www.googleapis.com/auth/pubsub</em></li>
</ul>
<p>If unset, the scope for this method defaults to <em>https://www.googleapis.com/auth/cloud-platform</em>.
You can set the scope for this method like this: <code>pubsub1 --scope &lt;scope&gt; projects subscriptions-modify-ack-deadline ...</code></p>
<h1 id="required-scalar-argument">Required Scalar Argument</h1>
<ul>
<li><strong>&lt;subscription&gt;</strong> <em>(string)</em><ul>
<li>Required. The name of the subscription. Format is <code>projects/{project}/subscriptions/{sub}</code>.</li>
</ul>
</li>
</ul>
<h1 id="required-request-value">Required Request Value</h1>
<p>The request value is a data-structure with various fields. Each field may be a simple scalar or another data-structure.
In the latter case it is advised to set the field-cursor to the data-structure's field to specify values more concisely.</p>
<p>For example, a structure like this:</p>
<pre><code>ModifyAckDeadlineRequest:
ack-deadline-seconds: integer
ack-ids: [string]
</code></pre>
<p>can be set completely with the following arguments which are assumed to be executed in the given order. Note how the cursor position is adjusted to the respective structures, allowing simple field names to be used most of the time.</p>
<ul>
<li><code>-r . ack-deadline-seconds=71</code><ul>
<li>Required. The new ack deadline with respect to the time this request was sent to the Pub/Sub system. For example, if the value is 10, the new ack deadline will expire 10 seconds after the <code>ModifyAckDeadline</code> call was made. Specifying zero might immediately make the message available for delivery to another subscriber client. This typically results in an increase in the rate of message redeliveries (that is, duplicates). The minimum deadline you can specify is 0 seconds. The maximum deadline you can specify in a single request is 600 seconds (10 minutes).</li>
</ul>
</li>
<li><code>ack-ids=takimata</code><ul>
<li>Required. List of acknowledgment IDs.</li>
<li>Each invocation of this argument appends the given value to the array.</li>
</ul>
</li>
</ul>
<h3 id="about-cursors">About Cursors</h3>
<p>The cursor position is key to comfortably set complex nested structures. The following rules apply:</p>
<ul>
<li>The cursor position is always set relative to the current one, unless the field name starts with the <code>.</code> character. Fields can be nested such as in <code>-r f.s.o</code> .</li>
<li>The cursor position is set relative to the top-level structure if it starts with <code>.</code>, e.g. <code>-r .s.s</code></li>
<li>You can also set nested fields without setting the cursor explicitly. For example, to set a value relative to the current cursor position, you would specify <code>-r struct.sub_struct=bar</code>.</li>
<li>You can move the cursor one level up by using <code>..</code>. Each additional <code>.</code> moves it up one additional level. E.g. <code>...</code> would go three levels up.</li>
</ul>
<h1 id="optional-output-flags">Optional Output Flags</h1>
<p>The method's return value a JSON encoded structure, which will be written to standard output by default.</p>
<ul>
<li><strong>-o out</strong><ul>
<li><em>out</em> specifies the <em>destination</em> to which to write the server's result to.
It will be a JSON-encoded structure.
The <em>destination</em> may be <code>-</code> to indicate standard output, or a filepath that is to contain the received bytes.
If unset, it defaults to standard output.</li>
</ul>
</li>
</ul>
<h1 id="optional-general-properties">Optional General Properties</h1>
<p>The following properties can configure any call, and are not specific to this method.</p>
<ul>
<li>
<p><strong>-p $-xgafv=string</strong></p>
<ul>
<li>V1 error format.</li>
</ul>
</li>
<li>
<p><strong>-p access-token=string</strong></p>
<ul>
<li>OAuth access token.</li>
</ul>
</li>
<li>
<p><strong>-p alt=string</strong></p>
<ul>
<li>Data format for response.</li>
</ul>
</li>
<li>
<p><strong>-p callback=string</strong></p>
<ul>
<li>JSONP</li>
</ul>
</li>
<li>
<p><strong>-p fields=string</strong></p>
<ul>
<li>Selector specifying which fields to include in a partial response.</li>
</ul>
</li>
<li>
<p><strong>-p key=string</strong></p>
<ul>
<li>API key. Your API key identifies your project and provides you with API access, quota, and reports. Required unless you provide an OAuth 2.0 token.</li>
</ul>
</li>
<li>
<p><strong>-p oauth-token=string</strong></p>
<ul>
<li>OAuth 2.0 token for the current user.</li>
</ul>
</li>
<li>
<p><strong>-p pretty-print=boolean</strong></p>
<ul>
<li>Returns response with indentations and line breaks.</li>
</ul>
</li>
<li>
<p><strong>-p quota-user=string</strong></p>
<ul>
<li>Available to use for quota purposes for server-side applications. Can be any arbitrary string assigned to a user, but should not exceed 40 characters.</li>
</ul>
</li>
<li>
<p><strong>-p upload-type=string</strong></p>
<ul>
<li>Legacy upload protocol for media (e.g. &#34;media&#34;, &#34;multipart&#34;).</li>
</ul>
</li>
<li>
<p><strong>-p upload-protocol=string</strong></p>
<ul>
<li>Upload protocol for media (e.g. &#34;raw&#34;, &#34;multipart&#34;).</li>
</ul>
</li>
</ul>
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