feat add spdlog

third_party/prometheus/3rdparty/civetweb/examples/README.md

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+
+Examples
+=====
+
+The ([embedded_c](https://github.com/civetweb/civetweb/tree/master/examples/embedded_c)) example shows
+how to embed civetweb into a C or C++ application.
+
+The ([embedded_cpp](https://github.com/civetweb/civetweb/tree/master/examples/embedded_cpp)) example
+demonstrates embedding in a C++ application. It uses the C++ wrapper of the full C interface `civetweb.h`.
+The C++ wrapper only offers a limited subset of the full C API.
+Thus, the C example is more complete than the C++ example.
+
+These examples were not designed with security in mind, but to show how the API can be used in principle.
+For more information, see the [documentation](https://github.com/civetweb/civetweb/tree/master/docs).
+Some examples can also be found in the [test](https://github.com/civetweb/civetweb/tree/master/test) folder,
+but they are less documented and adapted to some special needs of the test frameworks.
+
+The ([https](https://github.com/civetweb/civetweb/tree/master/examples/https)) example shows how to configure
+a HTTPS server with improved security settings.
+It does not hold any source, but only a configuration file and some documentation how to use it.
+
+The ([embed_certificate](https://github.com/civetweb/civetweb/tree/master/examples/embed_certificate)) example 
+shows embed civetweb in a C application without using additional files on the disk. The HTTPS certificate is
+directly embedded in the code and all content is generated by a callback. It is a template for using civetweb
+on (embedded) devices without a file system - or for systems that do not want CivetWeb to access the disk.
+
+The [multidomain](https://github.com/civetweb/civetweb/tree/master/examples/multidomain) example demonstrates 
+how to host multiple domains with different HTTPS certificates. 
+It uses the standalone server (civetweb.c + main.c) and existing certificates.
+
+The [ws_client](https://github.com/civetweb/civetweb/tree/master/examples/ws_client) example shows 
+how to use the websocket client interface to communicate with an (external) websocket server. 
+It uses the "echo demo" of [websocket.org](http://websocket.org/echo.html) and will work only if this server is reachable.
+
+All examples are subject to the MIT license (unless noted otherwise) - they come without warranty of any kind.
+
+Note that the examples are only meant as a demonstration how to use CivetWeb.
+The example codes are omitting some error checking and input validation for better readability of the source.
+They are not as actively maintained and continuously developed as main source of the project 
+(include/civetweb.h, src/civetweb.c, src/*.inl).  
+Example codes undergo less quality management than the main source files of this project.
+Examples are not checked and updated with every new version.
+There are no repeated security assessment for the example codes, settings are not updated on a regular basis.
+
+Contributions to examples code are welcome, under the same conditions as contributions to the 
+main source code ([Contribution.md](https://github.com/civetweb/civetweb/blob/master/Contribution.md)).