HTTP and HTTPS example application for Mbed OS 5

Dependencies:   mbed-http

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

It consists of six example applications, which you can select in source/select-demo.h:

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. If you're using WiFi, specify the credentials in mbed_app.json.
  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.

Defining the network interface

This application uses the on-board network interface for your board. If you use an external network interface (f.e. a WiFi module) you need to add the driver to this project. Then, open network-helper.h and specify which network driver to use.

More information is in the Mbed OS documentation under IP Networking.

Entropy (or lack thereof)

On all platforms that do not have the TRNG feature, 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, you can disable unused cypher suites and other Mbed TLS features with a custom configuration file. Create a new configuration file, then add in mbed_app.json:


to the macros array.

Running tests

You can run the integration tests from this project via Mbed CLI.

  1. In select-demo.h set the DEMO macro to DEMO_TESTS.
  2. Set your WiFi credentials in mbed_app.json.
  3. Then run the tests via:

$ mbed test -v -n mbed-http-tests-tests-*

Tested on

  • K64F with Ethernet.
  • NUCLEO_F411RE with ESP8266 (not working on Mbed OS 5.12+)
  • ODIN-W2 with WiFi.
  • K64F with Atmel 6LoWPAN shield.
  • DISCO-L475VG-IOT01A with WiFi (requires the wifi-ism43362 driver).


RevisionDateWhoCommit message
35:4b847971db1b 2019-01-04 Jan Jongboom Update to Mbed OS 5.11 default tip
34:7da6cfc032fc 2018-12-05 Jan Jongboom Update CA
33:2efadc4d8784 2018-10-30 Jan Jongboom Revert back to DEMO_HTTP
32:5fa61ebc2689 2018-10-30 Jan Jongboom Update to Mbed OS 5.10, update to use TLSSocket
31:66704f6f17c5 2018-10-30 Jan Jongboom Update to new mbed-http, which uses TLSSocket mbed-os-5.10
30:4825e4f38844 2018-10-29 Jan Jongboom Update to Mbed OS 5.10, with default network interface mbed-os-5.10
29:5ad8f931e4ff 2018-03-27 Jan Jongboom Move serial baud rate config into mbed_app.json
28:9bccd981a393 2018-03-27 Jan Jongboom Compile without requiring RTOS
27:6554d4f5f1c3 2018-01-25 Jan Jongboom Fix superfluous \r\n after request body in mbed-http
26:22f87edb433c 2018-01-12 Jan Jongboom Set demo back to HTTP
25:a8be9f3a530c 2018-01-11 Jan Jongboom Update mbed-http, add chunked requests
24:9faf23bbfb7f 2018-01-03 Jan Jongboom Bump mbed-http - Fix for
23:6a9d776c9794 2018-01-02 Jan Jongboom Set stack size to 8K
22:1b8c2a81c85d 2018-01-02 Jan Jongboom Update easy-connect, Mbed OS to 5.7.1, add IPv6 example
21:903bdf9a49f4 2017-12-15 Jan Jongboom Update mbed-http
20:d851bc648f9e 2017-11-18 Jan Jongboom Remove heap stats tracking
19:fbf5b033149a 2017-10-26 Jan Jongboom Add note on flash size
18:b661324be638 2017-10-26 Jan Jongboom Example mbed TLS config added, which shaves off 150K
17:97b1dd566b07 2017-09-04 Jan Jongboom Enable entropy sources for ODIN-W2; add note on memory usage
16:1374b4c35897 2017-09-04 Jan Jongboom Update mbed-http, was leaking 1024 bytes of memory in tls_socket
15:65a49b573ba5 2017-07-27 Jan Jongboom Update easy-connect and mbed-os
14:3c173847e681 2017-03-30 Jan Jongboom Bump mbed-http, treat response without Content-Length but with a body as chunked
13:5a210d227769 2017-03-30 Jan Jongboom Bump mbed-http
12:4c226ca06191 2017-03-28 Jan Jongboom Add socket reuse demo's
11:72c089200302 2017-03-28 Jan Jongboom Add socket reuse
10:e79a808ebbe8 2017-03-28 Jan Jongboom Add Lets Encrypt CA, so works again, bump mbed-http
9:6925d0c8c62f 2017-03-02 Jan Jongboom Bump mbed-http, now handles URLs without a path
8:960efb92bd84 2017-03-02 Jan Jongboom Bump mbed-http, now compiles against ARMCC
7:5d32909f77de 2017-02-24 Jan Jongboom Add chunked encoding, make HttpResponse own response headers
6:4a3ed1515bed 2017-02-23 Jan Jongboom Bump mbed-http, rely on is_body_complete() in HTTPS requests too
5:42f713b19337 2017-02-23 Jan Jongboom Rely on Content-Length, allocate body on the heap
4:27fd8efb5bab 2017-02-23 Jan Jongboom Increase MBEDTLS_MPI_MAX_SIZE so HTTPS calls to httpbin work as well
3:0f5859a9e3de 2017-02-16 Jan Jongboom Update mbed-http
2:4b4ac59ff9b0 2017-02-16 Jan Jongboom Move mbed-http into a separate library
1:3bff14db67c7 2017-02-16 Jan Jongboom Add mbed-http
0:85fdc69bc10c 2017-02-15 Jan Jongboom Initial commit