mbed-os-example-http(s)¶

This application demonstrates how to make HTTP and HTTPS requests and parse the response from mbed OS 5.

It consists of four demo's, which you can select in source/select-demo.h.

• HTTP demo:
  • Does a GET request to http:httpbin.org/status/418.
  • Does a POST request to http:httpbin.org/post.
• HTTPS demo:
  • Does a GET request to https:developer.mbed.org/media/uploads/mbed_official/hello.txt.
  • Does a POST request to https:httpbin.org/post.
• HTTP demo with socket re-use.
• HTTPS demo with socket re-use.

Response parsing is done through nodejs/http-parser.

Note: HTTPS requests do not work on targets with less than 128K of RAM due to the size of the TLS handshake. For more background see mbed-http.

To build¶

1. Open mbed_app.json and change the network-interface option to your connectivity method (more info).
2. Build the project in the online compiler or using mbed CLI.
3. Flash the project to your development board.
4. Attach a serial monitor to your board to see the debug messages.

Entropy (or lack thereof)¶

On all platforms except the FRDM-K64F, FRDM-K22F and EVK-ODIN-W2, the application is compiled without TLS entropy sources. This means that your code is inherently unsafe and should not be deployed to any production systems. To enable entropy, remove the MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES and MBEDTLS_TEST_NULL_ENTROPY macros from mbed_app.json.

Flash size¶

Default flash size for HTTPS is very large, as the application is loading the default mbed TLS configuration. To use a more optimized version, include mbedtls_config.h in your mbed_app.json, by adding:

"MBEDTLS_CONFIG_FILE=\"fotalora_mbedtls_config.h\""

to the macros array.

Tested on¶

• K64F with Ethernet.
• NUCLEO_F411RE with ESP8266.
• ODIN-W2 with WiFi.