HTTPS POST Timeout

[tkralj]

Hello. I am using TinyGSM lib v 0.79 ESP32 core 1.0.2. and ArduinoHttpClient 0.4.0. I am trying to post some data to my WebAPI. I am sending data over SSL. When i call WebAPI endpoint using GET method everything works fine, i get response from WebAPI. When i call WebAPI using POST method the request times out. I checked IIS log and it seems that POST never got to IIS.

Here's the code:

HttpClient https(client, server, port); https.connectionKeepAlive(); // Currently, this is needed for HTTPS https.beginRequest();

client.print(String(F("POST /ssm/MyEndPoint?tid=a347a95c-b91f-48ae-8a36-0fcd58ca2313&time=1970.05.09 08:18:59&amount=2.00&rsnd=false&code=0000 HTTP/1.1")));
client.print(String(F("\r\nContent-Type: text/plain")));
client.print(String(F("\r\ncontent-length: 0")));
client.print(String(F("\r\nUser-Agent: MyAgent")));
client.print(String(F("\r\nAccept: */*")));
client.print(String(F("\r\nhost: iot-test.softlab.hr")));
client.print(String(F("\r\napi-key: 112fc55a-451d-3e40-aff8-955aa3f84157")));
client.print(String(F("\r\nAuthorization: "))+ AuthString);
client.print(String(F("\r\n\r\n")));
client.print(String(""));

https.endRequest();

int statusCode = https.responseStatusCode(); res = https.responseBody();

https.stop();

Here's TinyGSM debug output: Initializing modem... [7340] ### TinyGSM Version: 0.7.9 [7540] ### Unhandled: ⸮⸮ [7655] ### Modem: SIMCOM SIM800L [7655] ### Modem: SIMCOM SIM800L Modem: SIM800 R14.18 Waiting for network... OK Network connected Connecting to wm OK Performing HTTPS POST request... [22518] ### Available: 0 on 1 [23538] ### Available: 0 on 1 [24558] ### Available: 0 on 1 [25578] ### Available: 0 on 1 [26596] ### Available: 0 on 1 [27614] ### Available: 0 on 1 [28633] ### Available: 0 on 1 [29650] ### Available: 0 on 1 [30668] ### Available: 0 on 1 [31685] ### Available: 0 on 1 [32704] ### Available: 0 on 1 [33721] ### Available: 0 on 1 [34739] ### Available: 0 on 1 [35757] ### Available: 0 on 1 [36775] ### Available: 0 on 1 [37792] ### Available: 0 on 1 [38809] ### Available: 0 on 1 [39827] ### Available: 0 on 1 [40845] ### Available: 0 on 1 [41863] ### Available: 0 on 1 [42881] ### Available: 0 on 1 [43899] ### Available: 0 on 1 [44917] ### Available: 0 on 1 [45934] ### Available: 0 on 1 [46953] ### Available: 0 on 1 [47971] ### Available: 0 on 1 [48988] ### Available: 0 on 1 [50006] ### Available: 0 on 1 [51023] ### Available: 0 on 1 [52041] ### Available: 0 on 1 [53059] ### Available: 0 on 1 [54077] ### Available: 0 on 1 [55095] ### Available: 0 on 1 [56113] ### Available: 0 on 1 [57131] ### Available: 0 on 1 [58148] ### Available: 0 on 1 [59165] ### Available: 0 on 1 [60183] ### Available: 0 on 1 [61200] ### Available: 0 on 1 [62218] ### Available: 0 on 1 [63236] ### Available: 0 on 1 [64253] ### Available: 0 on 1 [65271] ### Available: 0 on 1 [66289] ### Available: 0 on 1 [67307] ### Available: 0 on 1 [68325] ### Available: 0 on 1 [69343] ### Available: 0 on 1 [70361] ### Available: 0 on 1 [71379] ### Available: 0 on 1 [72397] ### Available: 0 on 1 [73415] ### Available: 0 on 1 [74433] ### Available: 0 on 1 [75450] ### Available: 0 on 1 [76468] ### Available: 0 on 1 [77485] ### Available: 0 on 1 [78503] ### Available: 0 on 1 [79521] ### Available: 0 on 1 [80539] ### Available: 0 on 1 [81557] ### Available: 0 on 1 [82574] ### Available: 0 on 1 [83591] ### Available: 0 on 1 [84092] ### Available: 0 on 1 Status: -3 Response:

Server disconnected GPRS disconnected

[tkralj]

One thing I noticed regardless of method POST or GET. You should never send empty char in your query string. For example if you "GET /api/MyMethod?name=some name" the GET will fail. You should always url encode querystring so it replaces empty chars with %20 . Maybe it could be implemented in the TinyGSMClient so it does url encoding ?

[tkralj]

It turned out to be my mistake. If you send POST request you have to set Content-Length header (even there is no content) for this to work.

[fedy0]

@tkralj Please what firmware version are you using? (To check, use AT+GSV?)