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91 lines
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<div id="projectname">GRPC PHP
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 <span id="projectnumber">1.64.0</span>
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<div class="title">gRPC Server Backward Compatibility Issues and Workarounds Management </div> </div>
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<div class="textblock"><h1><a class="anchor" id="autotoc_md234"></a>
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Introduction</h1>
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<p>This document lists the workarounds implemented on gRPC servers for record and reference when users need to enable a certain workaround.</p>
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<h1><a class="anchor" id="autotoc_md235"></a>
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Workaround List</h1>
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<h2><a class="anchor" id="autotoc_md236"></a>
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Cronet Compression</h2>
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<p><b>Workaround ID:</b> WORKAROUND_ID_CRONET_COMPRESSION</p>
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<p><b>Date added:</b> May 06, 2017</p>
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<p><b>Status:</b> Implemented in C core and C++</p>
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<p><b>Issue:</b> Before version v1.3.0-dev, gRPC iOS client's Cronet transport did not implement compression. However the clients still claim to support compression. As a result, a client fails to parse received message when the message is compressed. The problem above was resolved in gRPC v1.3.0-dev. For backward compatibility, a server must forcingly disable compression for gRPC clients of version lower than or equal to v1.3.0-dev.</p>
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<p><b>Workaround Description:</b> Implemented as a server channel filter in C core. The filter identifies the version of peer client with incoming <code>user-agent</code> header of each call. If the client's gRPC version is lower that or equal to v1.3.x, a flag GRPC_WRITE_NO_COMPRESS is marked for all send_message ops which prevents compression of the messages to be sent out. </p>
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