Question 1

How to set up HTTPS with cpp-httplib?

Accepted Answer

Define CPPHTTPLIB_OPENSSL_SUPPORT (or other TLS backends), include httplib.h, and use SSLServer with certificate and key files. The README provides examples for multiple TLS backends and custom verification callbacks.

Question 2

Does cpp-httplib support asynchronous requests?

Accepted Answer

No, it uses a blocking I/O model. The README states clearly that if you need non-blocking socket I/O, this is not the library for you, making it unsuitable for async-heavy applications.

Question 3

cpp-httplib vs Boost.Beast for HTTP in C++

Accepted Answer

cpp-httplib is simpler and header-only with built-in features like static serving, while Boost.Beast offers lower-level, asynchronous control but requires more boilerplate. Choose cpp-httplib for quick integration, Boost.Beast for high-performance customization.

Question 4

How to handle file uploads in cpp-httplib?

Accepted Answer

Use the multipart form data handling: parse req.form for files and fields, sanitize filenames with httplib::sanitize_filename, and save content. The README includes a detailed example with code for validation and streaming.

Question 5

Can cpp-httplib be used on Raspberry Pi or ARM devices?

Accepted Answer

Yes, for 64-bit ARM systems, as it's cross-platform. However, avoid 32-bit ARM due to the library's lack of support and potential security issues mentioned in the warnings.

Question 6

What TLS backends are supported and what are their limitations?

Accepted Answer

Supports OpenSSL 3.0+, Mbed TLS 2.x/3.x, and wolfSSL 5.x. Mbed TLS and wolfSSL have limitations: get_ca_certs() only reflects certificates loaded via load_ca_cert_store(), not system certs.

Question 7

How to compress responses with cpp-httplib?

Accepted Answer

Enable compression support via CPPHTTPLIB_ZLIB_SUPPORT for gzip, CPPHTTPLIB_BROTLI_SUPPORT, or CPPHTTPLIB_ZSTD_SUPPORT, then link the libraries. The server compresses compatible MIME types automatically, detailed in the Compression section.

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