Question 1

How do I send a POST request with JSON data using cpr?

Accepted Answer

Use cpr::Post with cpr::Body for raw JSON and set the Content-Type header to 'application/json'. For example: cpr::Post(cpr::Url{"url"}, cpr::Body{"{\"key\":\"value\"}"}, cpr::Header{{"Content-Type", "application/json"}}). This mirrors the Python Requests style shown in the README.

Question 2

Is cpr thread-safe for making concurrent requests?

Accepted Answer

Yes, cpr ensures thread-safe access to libcurl as mentioned in the features section. You can safely use it in multi-threaded applications, but manage session objects like cpr::Session appropriately to avoid conflicts.

Question 3

cpr vs libcurl: which should I use for my C++ project?

Accepted Answer

Choose cpr if you want a high-level, expressive API that reduces boilerplate and mimics Python Requests. Opt for libcurl directly if you need fine-grained control over HTTP connections, such as custom callbacks or performance tuning, as cpr abstracts some low-level details.

Question 4

How to handle SSL certificates and HTTPS in cpr?

Accepted Answer

cpr uses OpenSSL or WinSSL for HTTPS automatically. For custom certificates, you can configure cpr::SslOptions, but advanced settings may require accessing underlying libcurl options, which are not fully exposed in the high-level API.

Question 5

Can cpr handle asynchronous HTTP requests?

Accepted Answer

Yes, cpr supports asynchronous requests through callback interfaces or future-based methods, allowing non-blocking network calls as listed in the features. This is useful for applications needing concurrent operations without blocking threads.

Question 6

How to install cpr on Ubuntu without using the system package?

Accepted Answer

The easiest method is via CMake fetch_content by adding it to your CMakeLists.txt, as detailed in the usage section. Alternatively, use vcpkg or Conan package managers for automated dependency management.

Question 7

Does cpr support HTTP/2 or WebSockets?

Accepted Answer

cpr relies on libcurl for underlying protocols, so HTTP/2 support depends on the linked libcurl version. WebSockets are not natively supported; you would need additional libraries or use libcurl directly with custom code.

cpr

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