![]() This must be present and have the value true to indicate a delimited list of messages has been sent. ![]() To determine whether the HTTP body contains a single message or a delimited list of messages an optional delimited parameter in the content-type is looked for. protoc sc Model.proto.įinally the HTTP body content may contain a single message or a list of messages which have been serialised using the standard protocol buffers length delimited format. A protocol buffers FileDescriptorSet can be generated from a *.proto file by the protocol buffers compiler (protoc) by using the -o or -descriptor_set_out option e.g. Charles looks for desc and messageType parameters in the content-type to discover the location of the FileDescriptorSet ( *.desc file) and fully qualified message type name, it then uses these to retrieve and load the appropriate descriptor for the message(s). ![]() In order for these viewers to be able to display the message content they need access to the protocol buffers descriptor for the message(s) that are contained in the HTTP body content. Two new HTTP body content viewers become available when viewing the content, the Protobuf Text Viewer and the Protobuf Structured Viewer. OverviewĬharles identifies that an HTTP request or response contains a Protocol Buffers message when the Content-Type header has a MIME type of application/x-protobuf or application/x-google-protobuf. As Protocol Buffers messages are commonly exchanged over HTTP we have added full support for viewing and editing Protocol Buffers messages in a human readable way.Ĭharles currently supports version 2.4.1 of Protocol Buffers, which is largely backwards compatible with earlier versions. The Protocol Buffers serialised format is a binary encoded format that is not easily human readable. You define how you want your data to be structured once, then you can use special generated source code to easily write and read your structured data to and from a variety of data streams and using a variety of languages – Java, C++, or Python. Protocol buffers are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data – think XML, but smaller, faster, and simpler. To quote from the Protocol Buffers website:
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