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 * Actually drop the connection when no response to ping arrives within the next interval.
 * Avoid sending immediate ping when wall time is adjusted, it's usually spurious.

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If file ends with .gz and has known "secondary extnesion", i.e. test.html.gz,
its content type is determined by the secondary extension and content-encoding is set to gzip.

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Also free up some RAM by not allocating ca_cert when `MBEDTLS_X509_CA_CHAIN_ON_DISK` is enabled.

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PUBLISHED_FROM=de1772bd6ea01f3dc467ceebb3b2af5cbe8eb240

CL: Add mg_strcasecmp()

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fix typo in tools/README.md

Fix ASAN build for examples/cookie_auth

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The ASAN build fails with
```
cookie_auth.c:62:7: error: variable 'ret' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
  if (cookie_header == NULL) goto clean;
      ^~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:84:10: note: uninitialized use occurs here
  return ret;
         ^~~
cookie_auth.c:62:3: note: remove the 'if' if its condition is always false
  if (cookie_header == NULL) goto clean;
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:65:3: note: variable 'ret' is declared here
  struct session *ret = NULL;
  ^
cookie_auth.c:62:7: error: variable 'ssid' is used uninitialized whenever 'if' condition is true [-Werror,-Wsometimes-uninitialized]
  if (cookie_header == NULL) goto clean;
      ^~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:81:7: note: uninitialized use occurs here
  if (ssid != ssid_buf) {
      ^~~~
cookie_auth.c:62:3: note: remove the 'if' if its condition is always false
  if (cookie_header == NULL) goto clean;
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cookie_auth.c:64:3: note: variable 'ssid' is declared here
  char *ssid = ssid_buf;
  ^
2 errors generated.
```

CL: none

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Moved to https://github.com/mongoose-os/mos

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CL: none

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CL: none

PUBLISHED_FROM=49d4f4a3c83520fd6ec9714b74333f75f3a2aa1c

Was not being enabled when it should have been.

CL: Fix locking in lwip net_if

PUBLISHED_FROM=4810e73417c7599f0ea08a09812ed320d02f7cae

tcpip_callback doesn't wait for the callback to run (as was previosuly assumed).

CL: mg_net_if_lwip: Fix invoking callbacks on tcpip thread

PUBLISHED_FROM=930c45f1346f9c3b024e5e684f4a452c762db92b

 * ARM
   * Provide MSP and PSP
   * Provide FreeRTOS task info
   * Profide target specification XML (extra regs and FPU / no FPU Cortex cores)
 * ESP32
   * Use uxTaskGetSystemState instead of uxTaskGetTaskHandles
 * General cleanup and refactoring

CL: Core dump analysis improvements

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All the platforms except esp32 (which uses heavily patched 9.0 from IDF) and esp8266 (doesn't use RTOS at all) are using the same version of FreeRTOS now.

CL: Make FreeRTOS a library, upgrade to 10.2.0

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