diff --git a/.github/workflows/ci-mobile.yml b/.github/workflows/ci-mobile.yml
new file mode 100644
index 0000000000..1b9d5d0d37
--- /dev/null
+++ b/.github/workflows/ci-mobile.yml
@@ -0,0 +1,86 @@
+#
+# GitHub Actions workflow for building cpprestsdk on iOS and Android
+#
+# Note: Please do not include any non-mobile targets in this workflow because
+#       we don't want a failure in one of several dozens Linux distributions
+#       hide a problem in the only 2 targets our mobile developers care about!
+#
+name: Mobile
+
+on: [push]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest,macos-latest]
+        flavor: [Release] # Only use one of Debug/Release (capitalized) for now to save on minutes
+      fail-fast: false
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Checkout Sources
+      uses: actions/checkout@v1
+      with:
+        fetch-depth: 1
+    - name: Update Submodules
+      run: git submodule update --init
+    - name: Build (iOS)
+      timeout-minutes: 30
+      run: |
+        set -x
+        mkdir -p bins/ios/cpprestsdk
+        pushd Build_iOS
+        BOOST_VERSION="1.71.0" OPENSSL_VERSION="1.1.1d" ./configure.sh -build_type ${{ matrix.flavor }}
+        ls -alFR .
+        if [ -f build.${{ matrix.flavor }}.ios/lib/libcpprest.a ]; then mv build.${{ matrix.flavor }}.ios/lib ${GITHUB_WORKSPACE}/bins/ios/cpprestsdk/; mv build.${{ matrix.flavor }}.ios/include ${GITHUB_WORKSPACE}/bins/ios/cpprestsdk/; fi
+        if [ -d openssl           ]; then mv openssl           ${GITHUB_WORKSPACE}/bins/ios/; fi
+        if [ -d boost.xcframework ]; then mv boost.xcframework ${GITHUB_WORKSPACE}/bins/ios/; fi
+      if: matrix.os == 'macos-latest'
+    - name: Build (Android)
+      timeout-minutes: 25
+      run: |
+        set -x
+        export NDK_ROOT=${ANDROID_SDK_ROOT}/ndk-bundle
+        echo "::set-env name=NDK_ROOT::$NDK_ROOT"
+        mkdir -p bins/android/cpprestsdk
+        pushd Build_android
+        mkdir build
+        pushd build
+        ../configure.sh --boost 1.69.0 --openssl 1.1.0j --ndk ${NDK_ROOT}
+        ls -alFR .
+        mv ${GITHUB_WORKSPACE}/Release/include ${GITHUB_WORKSPACE}/bins/android/cpprestsdk/ || true
+        if [ -f   build.armv7.debug/Release/Binaries/libcpprest.a ]; then mkdir -p ${GITHUB_WORKSPACE}/bins/android/cpprestsdk/libs/armeabi-v7a/Debug;   mv   build.armv7.debug/Release/Binaries/libcpprest.a ${GITHUB_WORKSPACE}/bins/android/cpprestsdk/libs/armeabi-v7a/Debug/;   fi
+        if [ -f build.armv7.release/Release/Binaries/libcpprest.a ]; then mkdir -p ${GITHUB_WORKSPACE}/bins/android/cpprestsdk/libs/armeabi-v7a/Release; mv build.armv7.release/Release/Binaries/libcpprest.a ${GITHUB_WORKSPACE}/bins/android/cpprestsdk/libs/armeabi-v7a/Release/; fi
+        if [ -f     build.x86.debug/Release/Binaries/libcpprest.a ]; then mkdir -p ${GITHUB_WORKSPACE}/bins/android/cpprestsdk/libs/x86/Debug;           mv     build.x86.debug/Release/Binaries/libcpprest.a ${GITHUB_WORKSPACE}/bins/android/cpprestsdk/libs/x86/Debug/;           fi
+        if [ -f   build.x86.release/Release/Binaries/libcpprest.a ]; then mkdir -p ${GITHUB_WORKSPACE}/bins/android/cpprestsdk/libs/x86/Release;         mv   build.x86.release/Release/Binaries/libcpprest.a ${GITHUB_WORKSPACE}/bins/android/cpprestsdk/libs/x86/Release/;         fi
+        if [ -d openssl                     ]; then mv openssl                     ${GITHUB_WORKSPACE}/bins/android/; fi
+        if [ -d Boost-for-Android/build/out ]; then mv Boost-for-Android/build/out ${GITHUB_WORKSPACE}/bins/android/boost; fi
+      if: matrix.os == 'ubuntu-latest'
+    - name: Prepare Binaries
+      timeout-minutes: 5
+      run: |
+        # It is about 30 times faster to zip artifacts first instead of letting
+        # upload artifact action send about 44K boost headers over the network.
+        # The artifact with binaries from both platforms takes about 345M, which
+        # is why we only create and upload them for tagged commits.
+        set -x
+        mkdir binaries
+        mkdir binaries/ios
+        mkdir binaries/android
+        if [ -d bins/android/cpprestsdk  ]; then (cd bins/android && zip -r ${GITHUB_WORKSPACE}/binaries/android/cpprestsdk.zip  cpprestsdk);      fi
+        if [ -d bins/android/openssl     ]; then (cd bins/android && zip -r ${GITHUB_WORKSPACE}/binaries/android/openssl.zip     openssl);         fi
+        if [ -d bins/android/boost       ]; then (cd bins/android && zip -r ${GITHUB_WORKSPACE}/binaries/android/boost.zip       boost);           fi
+        if [ -d bins/ios/cpprestsdk      ]; then (cd bins/ios     && zip -r ${GITHUB_WORKSPACE}/binaries/ios/cpprestsdk.zip      cpprestsdk);      fi
+        if [ -d bins/ios/openssl         ]; then (cd bins/ios     && zip -r ${GITHUB_WORKSPACE}/binaries/ios/openssl.zip         openssl);         fi
+        if [ -d bins/ios/boost.xcframework ]; then (cd bins/ios   && zip -r ${GITHUB_WORKSPACE}/binaries/ios/boost.xcframework.zip boost.xcframework); fi
+        ls -alFR binaries
+      if: contains(github.ref, 'tags')
+    - name: Upload Binaries
+      timeout-minutes: 2
+      uses: actions/upload-artifact@v2
+      with:
+        name: binaries
+        path: ./binaries
+      if: contains(github.ref, 'tags')
diff --git a/Build_android/configure.sh b/Build_android/configure.sh
index 59b35659ae..3e7a1ae73f 100755
--- a/Build_android/configure.sh
+++ b/Build_android/configure.sh
@@ -151,12 +151,11 @@ if [ "${DO_OPENSSL}" == "1" ]; then (
 # -----
 # Uses the build script from Moritz Wundke (formerly MysticTreeGames)
 # https://github.com/moritz-wundke/Boost-for-Android
-# (plus the patch https://github.com/o01eg/Boost-for-Android/tree/ndk-bump-21)
 
 if [ "${DO_BOOST}" == "1" ]; then (
-    if [ ! -d 'Boost-for-Android' ]; then git clone https://github.com/o01eg/Boost-for-Android/; fi
+    if [ ! -d 'Boost-for-Android' ]; then git clone https://github.com/moritz-wundke/Boost-for-Android; fi
     cd Boost-for-Android
-    git checkout 7626dd6f7cab7866dce20e685d4a1b11194366a7
+    git checkout c439278a9e7b33b8a176c172bb573c2f665d9179
     PATH="$PATH:$NDK_DIR" \
     CXXFLAGS="-std=gnu++11" \
     ./build-android.sh \
diff --git a/Build_iOS/.gitignore b/Build_iOS/.gitignore
index 93f4744bb6..826b4d6133 100644
--- a/Build_iOS/.gitignore
+++ b/Build_iOS/.gitignore
@@ -1,7 +1,7 @@
 # iOS folders that dependencies get stored in
 boostoniphone/
 boost
-boost.framework/
+boost.xcframework/
 ios-cmake/
 openssl/
 OpenSSL-for-iPhone/
\ No newline at end of file
diff --git a/Build_iOS/configure.sh b/Build_iOS/configure.sh
index 7045be58fc..0fc6407ad1 100755
--- a/Build_iOS/configure.sh
+++ b/Build_iOS/configure.sh
@@ -91,18 +91,15 @@ git submodule update --init
 
 ## Build Boost
 
-if [ ! -e $ABS_PATH/boost.framework ] && [ ! -d $ABS_PATH/boost ]; then
+if [ ! -e $ABS_PATH/boost.xcframework ] && [ ! -d $ABS_PATH/boost ]; then
     if [ ! -d "${ABS_PATH}/Apple-Boost-BuildScript" ]; then
         git clone https://github.com/faithfracture/Apple-Boost-BuildScript ${ABS_PATH}/Apple-Boost-BuildScript
     fi
     pushd ${ABS_PATH}/Apple-Boost-BuildScript
-    git checkout 8c42427b4ebc7865eb99b0a0b9607888af2c6abc
+    git checkout 27ca8978bf3ee029f699356a7d044a5a1fc0cd84
     BOOST_LIBS="thread chrono filesystem regex system random" ./boost.sh -ios -tvos --boost-version $BOOST_VERSION
     popd
-    mv ${ABS_PATH}/Apple-Boost-BuildScript/build/boost/${BOOST_VERSION}/ios/framework/boost.framework ${ABS_PATH}
-    mv ${ABS_PATH}/boost.framework/Versions/A/Headers ${ABS_PATH}/boost.headers
-    mkdir -p ${ABS_PATH}/boost.framework/Versions/A/Headers
-    mv ${ABS_PATH}/boost.headers ${ABS_PATH}/boost.framework/Versions/A/Headers/boost
+    mv ${ABS_PATH}/Apple-Boost-BuildScript/dist/boost.xcframework ${ABS_PATH}
 fi
 
 ## Build OpenSSL
diff --git a/README.md b/README.md
index a1f46ab4fb..222fd9b29e 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,8 @@ The C++ REST SDK is a Microsoft project for cloud-based client-server communicat
 [![openSUSE Tumbleweed package](https://repology.org/badge/version-for-repo/opensuse_tumbleweed/cpprestsdk.svg)](https://repology.org/metapackage/cpprestsdk)</br>
 [![Debian Testing package](https://repology.org/badge/version-for-repo/debian_testing/cpprestsdk.svg)](https://repology.org/metapackage/cpprestsdk)</br>
 
-[![Build Status](https://dev.azure.com/vclibs/cpprestsdk/_apis/build/status/Microsoft.cpprestsdk.Ubuntu)](https://dev.azure.com/vclibs/cpprestsdk/_build/latest?definitionId=1)
+[![Build Status](https://dev.azure.com/vclibs/cpprestsdk/_apis/build/status/Microsoft.cpprestsdk.Ubuntu)](https://dev.azure.com/vclibs/cpprestsdk/_build/latest?definitionId=1)</br>
+[![Build Status: Mobile](https://github.com/microsoft/cpprestsdk/workflows/Mobile/badge.svg)](https://github.com/microsoft/cpprestsdk/actions)
 
 With [vcpkg](https://github.com/Microsoft/vcpkg) on Windows
 ```
diff --git a/Release/CMakeLists.txt b/Release/CMakeLists.txt
index 13a3f01db8..cf4eadd655 100644
--- a/Release/CMakeLists.txt
+++ b/Release/CMakeLists.txt
@@ -15,9 +15,21 @@ set(CPPREST_VERSION_REVISION 16)
 
 enable_testing()
 
-set(WERROR ON CACHE BOOL "Treat Warnings as Errors.")
+if(IOS)
+  # We disable warnings as errors on iOS because of command-line warning:
+  #     clang: warning: overriding '-mios-simulator-version-min=8.0' option with '--target=arm64-apple-ios13.5' [-Woverriding-t-option]
+  # which for some reason can't be disabled from cmake the usual way.
+  set(WERROR OFF CACHE BOOL "Treat Warnings as Errors.")
+  # We exclude compression on iOS for now because of the problem I described
+  # in greater details in this StackOverflow post:
+  # https://stackoverflow.com/questions/58628377/catalina-c-using-cmath-headers-yield-error-no-member-named-signbit-in-th/59780819#59780819
+  set(CPPREST_EXCLUDE_COMPRESSION ON  CACHE BOOL "Exclude compression functionality.")
+else()
+  set(WERROR ON  CACHE BOOL "Treat Warnings as Errors.")
+  set(CPPREST_EXCLUDE_COMPRESSION OFF CACHE BOOL "Exclude compression functionality.")
+endif()
+
 set(CPPREST_EXCLUDE_WEBSOCKETS OFF CACHE BOOL "Exclude websockets functionality.")
-set(CPPREST_EXCLUDE_COMPRESSION OFF CACHE BOOL "Exclude compression functionality.")
 set(CPPREST_EXCLUDE_BROTLI ON CACHE BOOL "Exclude Brotli compression functionality.")
 set(CPPREST_EXPORT_DIR cmake/cpprestsdk CACHE STRING "Directory to install CMake config files.")
 set(CPPREST_INSTALL_HEADERS ON CACHE BOOL "Install header files.")
diff --git a/Release/cmake/cpprest_find_boost.cmake b/Release/cmake/cpprest_find_boost.cmake
index 3c857bafa0..9c356f51a9 100644
--- a/Release/cmake/cpprest_find_boost.cmake
+++ b/Release/cmake/cpprest_find_boost.cmake
@@ -30,8 +30,8 @@ function(cpprest_find_boost)
       set(Boost_INCLUDE_DIR "${IOS_SOURCE_DIR}/boost/include" CACHE INTERNAL "")
     else()
       set(IOS_SOURCE_DIR "${PROJECT_SOURCE_DIR}/../Build_iOS")
-      set(Boost_LIBRARIES "${IOS_SOURCE_DIR}/boost.framework/boost" CACHE INTERNAL "")
-      set(Boost_INCLUDE_DIR "${IOS_SOURCE_DIR}/boost.framework/Headers" CACHE INTERNAL "")
+      set(Boost_LIBRARIES "${IOS_SOURCE_DIR}/boost.xcframework/boost" CACHE INTERNAL "")
+      set(Boost_INCLUDE_DIR "${IOS_SOURCE_DIR}/boost.xcframework/Headers" CACHE INTERNAL "")
     endif()
   elseif(ANDROID)
     set(Boost_COMPILER "-clang")