diff --git a/.github/scripts/delete-asset.sh b/.github/scripts/delete-asset.sh
index 551dac900..c6a3484c1 100755
--- a/.github/scripts/delete-asset.sh
+++ b/.github/scripts/delete-asset.sh
@@ -1,39 +1,23 @@
 #!/bin/sh -eux
 
-check_errors() {
-        TYPE=$(echo "$1" | jq -r type)
-        if [ "$TYPE" != object ]; then
-                return
-        fi
-        ERRORS=$(echo "$1" | jq -r '.errors')
-        if [ "$ERRORS" != null ]; then
-                echo $ERRORS >&2
-                exit 1
-        fi
-}
-
-check_type() {
-        TYPE=$(echo "$1" | jq -r type)
-        if [ "$TYPE" != "$2" ]; then
-                return
-        fi
-}
+. $(dirname $0)/json-common.sh
 
 TAG_NAME=${1?}
 PATTERN=${2?}
-JSON=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -X GET https://api.github.com/repos/$GITHUB_REPOSITORY/releases/tags/$TAG_NAME)
-check_errors "$JSON"
+JSON=$(fetch_json https://api.github.com/repos/$GITHUB_REPOSITORY/releases/tags/$TAG_NAME $GITHUB_TOKEN)
 RELEASE_ID=$(echo "$JSON" | jq -r '.id')
-JSON=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -X GET https://api.github.com/repos/$GITHUB_REPOSITORY/releases/$RELEASE_ID/assets)
-check_errors "$JSON"
-check_type "$JSON" array 
+JSON=$(fetch_json https://api.github.com/repos/$GITHUB_REPOSITORY/releases/$RELEASE_ID/assets $GITHUB_TOKEN array)
 LEN=$(echo "$JSON" | jq length)
 for n in `seq 0 $(($LEN-1))`; do
         NAME=$(echo "$JSON" | jq '.['$n'].name')
         if expr "$NAME" : "\"$PATTERN\"$"; then
                 ID=$(echo "$JSON" | jq '.['$n'].id')
-                JSON=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -X DELETE "https://api.github.com/repos/$GITHUB_REPOSITORY/releases/assets/$ID")
+                TMPNAME=$(mktemp)
+                STATUS=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -X DELETE "https://api.github.com/repos/$GITHUB_REPOSITORY/releases/assets/$ID" -w %{http_code} -o $TMPNAME)
+                JSON=$(cat $TMPNAME)
+                rm $TMPNAME
                 check_errors "$JSON"
+                check_status $STATUS
         fi
 done
 
diff --git a/.github/scripts/json-common.sh b/.github/scripts/json-common.sh
new file mode 100644
index 000000000..62b1b7565
--- /dev/null
+++ b/.github/scripts/json-common.sh
@@ -0,0 +1,54 @@
+check_errors() {
+        TYPE=$(echo "$1" | jq -r type)
+        if [ "$TYPE" != object ]; then
+                return
+        fi
+        ERRORS=$(echo "$1" | jq -r '.errors')
+        if [ "$ERRORS" != null ]; then
+                echo $ERRORS >&2
+                exit 1
+        fi
+}
+
+check_type() {
+        TYPE=$(echo "$1" | jq -r type)
+        if [ "$TYPE" != "$2" ]; then
+                echo "Wrong JSON type - expected $2, got $TYPE" >&2
+                echo "JSON: $JSON" >&2
+                exit 1
+        fi
+}
+
+## @brief Returns json for given URL and authorization token while checking errors
+## @param $1 URL
+## @param $2 GITHUB_TOKEN
+## @param $3 requested type (optional)
+fetch_json() {
+        TMPNAM=$(mktemp)
+        STATUS=$(curl -S -H "Authorization: token ${2?GitHub token is required}" -X GET ${1?URL is required} -w "%{http_code}" -o $TMPNAM)
+        JSON=$(cat $TMPNAM)
+        rm $TMPNAM
+        if [ $STATUS -ne 200 ]; then
+                echo "HTTP error code $STATUS" >&2
+                echo "JSON: $JSON" >&2
+        fi
+        check_errors "$JSON"
+        if [ -n ${3-""} ]; then
+                check_type "$JSON" $3
+        fi
+        echo "$JSON"
+}
+
+## @brief Checks HTTP error code for success
+## @param $1 returned HTTP status code
+## @param $2 (optional) returned JSON (to be printed in case of error)
+check_status() {
+        if [ $1 -lt 200 -o $1 -ge 300 ]; then
+                echo "Wrong response status $STATUS!" >&2
+                if [ -n ${2-""} ]; then
+                        echo "JSON: $JSON" >&2
+                fi
+                exit 1
+        fi
+}
+
diff --git a/.github/scripts/upload-asset.sh b/.github/scripts/upload-asset.sh
index 58e8021bb..3f4e9216b 100755
--- a/.github/scripts/upload-asset.sh
+++ b/.github/scripts/upload-asset.sh
@@ -1,26 +1,19 @@
 #!/bin/sh -eu
 
-check_errors() {
-        TYPE=$(echo "$1" | jq -r type)
-        if [ "$TYPE" != object ]; then
-                return
-        fi
-        ERRORS=$(echo "$1" | jq -r '.errors')
-        if [ "$ERRORS" != null ]; then
-                echo $ERRORS >&2
-                exit 1
-        fi
-}
+. $(dirname $0)/json-common.sh
 
 TAG_NAME=${1?}
 FILE=${2?}
 CONTENT_TYPE=${3?}
 LABEL=${4?}
 
-JSON=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -X GET https://api.github.com/repos/$GITHUB_REPOSITORY/releases/tags/$TAG_NAME)
-check_errors "$JSON"
+JSON=$(fetch_json https://api.github.com/repos/$GITHUB_REPOSITORY/releases/tags/$TAG_NAME $GITHUB_TOKEN)
 UPLOAD_URL=$(echo "$JSON" | jq -r .upload_url | sed "s/{.*}//")
 
-JSON=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -H "Content-Type: $CONTENT_TYPE" -X POST "$UPLOAD_URL?name=$FILE&label=$LABEL" -T $FILE)
+TMPNAME=$(mktemp)
+STATUS=$(curl -S -H "Authorization: token $GITHUB_TOKEN" -H "Content-Type: $CONTENT_TYPE" -X POST "$UPLOAD_URL?name=$FILE&label=$LABEL" -T $FILE -w %{http_code} -o $TMPNAME)
+JSON=$(cat $TMPNAME)
+rm $TMPNAME
 check_errors "$JSON"
+check_status $STATUS