send POST request html - html

I'm trying to create a post request from the following header.
POST /Create_New_Account.php HTTP/1.0
Connection: keep-alive
Content-Type: multipart/form-data; boundary=--------092818025341241
Content-Length: 198
Host: test.com
Accept: text/html, */*
Accept-Encoding: identity
User-Agent: Mozilla/3.0 (compatible; Indy Library)
----------092818025341241
Content-Disposition: form-data; name="email"
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
test#yahoo.com
----------092818025341241--
I tried using http://test.com/Create_New_Account.php?email=test#yahoo.com
but it didn't work i.e. no account was created. should i be adding anything else to my request?


I tried using http://test.com/Create_New_Account.php?email=test#yahoo.com but it didn't work
Possibly, Create_New_Account.php uses $_POST in order to get parameter email, with given link email is accesible through $_GET or $_REQUEST and not $_POST, which is why the overall create account operation fails.

Related

Reverse Engineer HTTP request

I intercepted an HTTP request on Charles originating from iPhone to Instagram and here are the headers
POST /logging_client_events HTTP/1.1
Host: graph.instagram.com
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Connection: keep-alive
Accept: */*
User-Agent: Instagram 10.0.1 (iPhone8,1; iOS 10_1_1; en_IN; en-IN; en; scale=2.00; 750x1334) AppleWebKit/420+
Accept-Language: en-IN;q=1.0, hi-IN;q=0.9,
Content-Length: 1601
Accept-Encoding: gzip, deflate
There is a Post data as well in the request that is compressed. My question is how can I uncompress the Post data? Perhaps any method in NSData that can decompress?
EDIT: Here is the complete HTTP request
POST /logging_client_events HTTP/1.1
Host: graph.instagram.com
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Connection: keep-alive
Accept: */*
User-Agent: Instagram 10.3.0 (iPhone8,1; iOS 10_1_1; en_IN; en-IN; scale=2.00; gamut=normal; 750x1334) AppleWebKit/420+
Accept-Language: en-IN;q=1, hi-IN;q=0.9
Content-Length: 4585
Accept-Encoding: gzip, deflate
message=eNrtXG1v4kgS%2FiunfLqTAupXtzvSfiAxZInOZsmQEPt0sowxYGNj1jZDYLX326%2FaMBNICJMsZCajTUZRwO6XqvJT1c%2FTtuePE286dcP%2BydkJJgwRxgUjumCYnZyezMrjCD4VYRKcnGGmU0GIQKiKGEWUnZa9PweZ6o6qtIr%2B8U%2BmIYGEwP%2BCbv3gc%2BgH6%2BHPBdcb51rFuJCNCmsYuKJf6EZFq%2BlMN2pGDV0I6DLwkjBeuJs9Gb1gBqnXK3rDqFfAPKMi8UWtYvCaIKyGOZM16JkHeR6mk1Wf8xqqo4sGhuYNvcIouaicn2ukQhr8HLzQ5LlGlYFe4Z2c%2FeePkyTtz2JwUTkExyee8vdkHvTy1B8Hheunk0ngF65XFEEyLR6HRJOkyhETQp6eBPdFBoP%2BcTIdwxCE6IxSHWvs5M8%2FT5%2BbKBy6vwducD9N81kW7Bxdl4xvDD7M0tkUehZBXrhgZOjFysgCGrgQBD8Og4kys4zGhhGnT8xSg06DDCaEDqUpYZq7gyDou7NB6GZBP8jD4eRg8zmjz9h%2FgJm59zk40DJJBZI7LMvSOE5nhxq3CmSRpnERTh9ZujoFneJwEjzYnAVB7IIxCzdMptkK1bss1zHBSGxYXvYBT8NC9ThDu%2ByMQ7CpnMFPZ8pYaFX220of1vOQlJT3PU2ygAVSoCDQexj7cuB5PoGBklkB1j8ayXOfzjjycjdZlC3LNp%2FDYP605ySYPz4U5u6Xo%2BD3kUMnNKy%2Fy9BxRDgl6L0GjhCKtPcYOCw1LHWpi3cbOU0I%2Bh4jxwXXpIDL%2Bl4jR%2BHL%2B0xWiTSJEf3ekQsneeENMy9x02zoTULfzWe9b0WRYUQ2gpinswwYVjpwPX8VxyezJS5YiNXf8P6ZMH9JPqYLKAyA8cdE7KG1SwhCmoHrFUSpVmE65hXJiKzUmDwX9QuBGoZWzroekmANuCb0pPCLMMLu1jTghz8OJ0NYXMeBMj9YXC29bn9m311jP7kJW2Ez%2FPfF1dy%2Bi%2FMeaYyb0VQ0k3h5Rxozu3vP%2B5dx5GOJ%2FKQReeRWnUf%2B5DaGPkvn7orA76B%2FKTOny9RY95YxXFrLOrIMe2EZTTIw6siM6sSM%2FLnZsZG5rBPLqN2bRkM3oyazDHPZMuDYr3NiR7W5Y9jEurSxZViRc2mFrc7VuHXZntvLm3tzeTuyl6NRq9tcOJGN7ChO7ATmjBqh1akRK7LnLaMxhvMwvjW2E5s1w3nYv7udOhdNrRn53InaBNou7K4zbnXgcxfGTG4jJ2kvra6JreUNjNskZqe9AHsX1rIG47eXpe1GfW5%2BupLgu%2FIb4ihnzSjFg%2FYvvyhWrrjQ3AXUFbNcIaX8DsE%2FjHsBJoXcxQo79U%2BdQ8nr57AfpK4fxLHrzYp0GkPy92bDAWB52%2BiV1niwe831FYT9kTcZ7jZdSkz2sf3TjXGUlAgH4dYxlbLFYqomvOhce%2F0wrfk%2BZE4n8EeTNE6Hi18%2FGb%2FVngY4Dn2vWCX52uDYm038kTvLvV6801hJgVNsqoe1yxCw30bpJNBPMXRL85WMw1X1LZyEBaSWux48gZOYy6rATEisqbKn3H%2Fq9Zd%2BE8BL2QlxGFAirlP40TQQjT1IXHWlJ31XtT45G3hxHjx0VQUJqrfqrWFRFZqmC45AnGJNf2i1crdspUtcZYKXhjGuYfqCoE1n%2BQiMLOC6rE7BylAUCtK7AsigdG1Wz57XHwYwc5HNwHAvDrLi67dcefb1246aCZpZZdKuS1eO605mSU%2BJaii5sQf67snRzJt%2FNfdM7MnBfpgp2ToLXciSwU7XBCZiExuDMIMppx7gfu0CrCqzWKVXPishujMP1XpXLk299F7Ns4J2Fvw%2BUwq1nBaOpgXo1P4sW12MM03yPcZngRerjipVcj8Le8E%2B%2FS2FBgDbcORrd0j%2B0IfxZnmQVfo5qTwY%2Fj%2By05nHM09LgHgxHO8voKSFubrcJWz32F%2Fq8UnhxqnXD%2Fo7bdYZQZs2f%2BmyDt90lBbpTgs3x15F9wwyF2LAOWFSSp0gjT40g5WiGAFUONpj78N2Rz%2Fsu%2Bk02EEkaFVyjW9JgFfsczy9ojvCwqqUUV2KvcX1hRf3lUQ0CwYA9tEumxgVQtP32nQ0zjkHLrnOtcEs%2FpKGO5noptlfUDMJinmajU9eSkLl42HWcGJaWRtQ%2BaMh%2FojkHpPlQ3w5FpQ8z%2FLpj1OWXFAJRIXoj2k%2BfkWED6L5iRdOVqxmD0Kh%2FGl4u%2F7lJffw07ivVpysgDEKf7SzoKy4HRjcV1MDVd%2BXx%2BWmsbIujstKnu%2ByR6dsfw4PehvjQCUocf4XBdA%2BcPEqSDQh5VupH5iDalIyio6qfiB%2BkhMuIAmRjqi7Nc0u9bPF3JWK%2BaYamlixP3FiP5aoR4q4FyolUUctw6SgYEirY3Jr6egrxQDqxxhjM7qhoIIWpjGcm3S%2BMKMhKB%2BTKRUBimhhdYb3ZtSmLaOf2F2lgGrcItdjk0CbaBRb3Zt767IRgWpatDo3S%2BvyOjSN25G1HHOrcwuqyEdWtxFZl%2FW51QFldGkqu6eg1Ea9pJEHd9dTm1qD%2Fq9XIxtsVuoHPmPn04YaSurUvFRKChTU0kocpXK61siM%2Bgkoqhj%2BhjAfKn14zrfFlXyl%2BnkxWFdL4HS1Q78LrJJpfw2sL1PoquNq%2BjMCpIEzqm5eYCY1rn8I8J9ZgL9qw2i9dn2zdEqdvg6Nz1v7gNRduHwp8p6i%2FAOL3wuLB%2BgdXuVcl1sc5TC9owuNcK2U%2FRTUn%2FZKvfMCewWMLI9mL0NIMkkFCDRo9gJ5dhT6o1Up4tv3OF9Nf%2FYtLQQxSoSG9OOyH0AKXF%2FEKcKYcndzlh9BflirYzNraQMpMSHD60vr7jH5sbnTGUJmQmYvx3Oze4PtTj80gciYBLK0cx1bSXthL60I%2Fo1tYlKr40Sm0ZxDJcGQ%2FcRW5KdTh6rgjFQGty6b34P8PPXt06vJzwj0fKr2WhfJYP30gNrb29CBfpokwaSvzoBW%2FxZkCSF4r3pYPZ1CYIXgjAssHvagnjVl656RFw%2FTLCxGyVengix3H46%2BsXtQucgL%2FKOQBpQTTfBX%2BYd%2FuH8gsrWXXD8oA1AWQem8yj%2By7Z%2FarXQzbzJ%2B1r9XFX6tyiRQDXG0wg%2FsWpdclBtzmKoHpx5XfinfQEuIKpFcZ%2FhnEL5bmoRwXRMCwbKlCZ2QD1n8t5DFL9AjCtEaouJjK%2BcDs%2B8Cs%2FvByghUsoPASvaBdePxk%2BNhVehch%2FVYEPiCBIywMcsPgKrPAIZzuKRwTknsGgUJ%2FQiqFpDoxtjstplFmthOGqHT8e%2FtTmNkR6OxgoDVuQZJPeROtxG2jPHcAahanThRnxUdb3Vux3b3BjnGVWR2AeCdm%2B8A1R2%2BXfyYXUcB0lwAzfwJNOIGUcBVrHON6QgopA5Vln0oyJ9YQR6XJ3C12vKPPY8PxL4dYl8lKgGSsLSS4%2B0mIoAGI7S8QY8Zpk%2F3EzVMDng%2BT1fPkyB%2B%2FJc2wAd1KzyfppM8zSAFY68XxErkfw6y%2FKD3OfQqIUKQNzB6%2FThhmqkHqsrHC4P5NM3UNRkOD4SGXqVUbD1fduh2g0YkxuWDQAA89VbSqzbGvx1lxgEZ2ptAI1x7nrqjcDiK4bd4DhpHoT56lYNZVPsJWPoG9UFV9QCqDiuE2uAB1v7B4f8OHH4f59GrwBw0chDnYXs5j65qKxXiyKRHI5rOOdQqwojmbk3zHcHa%2F8p6LHXMuMGtzpibUXthTR6D9Ta0uzazI8VynLGdXIV2p4nUPgiwHdS6tACw1xGwHYBQY%2BR04XPHiR3DX9qJAqpJHWNIACwwd3PRMtrcSerfBKsDx31ykzcnt9jrtsHXq5G1PA%2FNxFZAXDqJuu%2FcgLma1Insewf%2B2pHPLaPGzNX9adZS96ujIbbAt1Zpsx0O7tCbsR5ZRYKgIy5t6gU5QAyQHqxID%2FtON1FlVTABMx%2BSXPzHJBfGnHDJOOLsfSTXPVTmBQAQaH8NP1kJLq9CVelNVdWXQ%2BokbSUxVHIxc9kGMI8XZqKSq87MLlT6y%2Fa93W1je3kFssOcW0lz6VzeLCDhIAmdEFYPkBW175ZcICXU5iMcv4EVq%2F3GyaVrkqMjSgoGDeQ6u7g4ZnI9T8HK%2F0%2BASibJz7BybXMwiBaVYLxAAutU%2F1jYfuaF7Rksqzdn1OszvsqDMqFyN1N3wrOnObnGsvjWywvr3usnnv97egIq8kvOrv7vBjf4vMqVPPgdoPbn%2FwGSB1Nz&compressed=1&access_token=124024574287414%7C84a456d620314b6e92a16d8ff1c792dc&format=json

TL;DR: use the following command line to decode such messages:
ipython -c "import zlib, base64, urllib; m='<message>';zlib.decompress(base64.decodestring(urllib.unquote(m)))"
While replacing <message> with the post parameter.
Full details:
This request uses several encoders one on top of another, but all encoders used are easily recognisable by an experienced researcher and probably experienced web developer.
By the characters appearing in the message POST argument, it's easy to identify the format is base64 encoding. However, percent characters (%) stand out as they're not part of the base64 character set. After further review it is easy to see a percent sign is always followed by only a few selection of characters (%2B, %2F). These are url encoded characters (specifically '+' and '/', respectively), both part of the base64 character set.
Thus, that string should be urldecoded and then base64 decoded, and we end up getting a more cryptic string as a result, but luckily no errors:
x\xda\xed\\mo\xe2H\x12\xfe+\xa7|\xba\x93\x02\xeaW\xb7;\xd2~
<snip>
The string consists of both printable and non-printable characters, but the first two characters, x\xda (or \x78\xda) have an important meaning as they're markers for a zlib compressed stream.
For example, running that one-line with your message would look exactly like that:
nir$ ipython -c "import zlib, base64, urllib; m='eNrtXG1v4kgS%2FiunfLqTAupXtzvSfiAxZInOZsmQEPt0sowxYGNj1jZDYLX326%2FaMBNICJMsZCajTUZRwO6XqvJT1c%2FTtuePE286dcP%2BydkJJgwRxgUjumCYnZyezMrjCD4VYRKcnGGmU0GIQKiKGEWUnZa9PweZ6o6qtIr%2B8U%2BmIYGEwP%2BCbv3gc%2BgH6%2BHPBdcb51rFuJCNCmsYuKJf6EZFq%2BlMN2pGDV0I6DLwkjBeuJs9Gb1gBqnXK3rDqFfAPKMi8UWtYvCaIKyGOZM16JkHeR6mk1Wf8xqqo4sGhuYNvcIouaicn2ukQhr8HLzQ5LlGlYFe4Z2c%2FeePkyTtz2JwUTkExyee8vdkHvTy1B8Hheunk0ngF65XFEEyLR6HRJOkyhETQp6eBPdFBoP%2BcTIdwxCE6IxSHWvs5M8%2FT5%2BbKBy6vwducD9N81kW7Bxdl4xvDD7M0tkUehZBXrhgZOjFysgCGrgQBD8Og4kys4zGhhGnT8xSg06DDCaEDqUpYZq7gyDou7NB6GZBP8jD4eRg8zmjz9h%2FgJm59zk40DJJBZI7LMvSOE5nhxq3CmSRpnERTh9ZujoFneJwEjzYnAVB7IIxCzdMptkK1bss1zHBSGxYXvYBT8NC9ThDu%2ByMQ7CpnMFPZ8pYaFX220of1vOQlJT3PU2ygAVSoCDQexj7cuB5PoGBklkB1j8ayXOfzjjycjdZlC3LNp%2FDYP605ySYPz4U5u6Xo%2BD3kUMnNKy%2Fy9BxRDgl6L0GjhCKtPcYOCw1LHWpi3cbOU0I%2Bh4jxwXXpIDL%2Bl4jR%2BHL%2B0xWiTSJEf3ekQsneeENMy9x02zoTULfzWe9b0WRYUQ2gpinswwYVjpwPX8VxyezJS5YiNXf8P6ZMH9JPqYLKAyA8cdE7KG1SwhCmoHrFUSpVmE65hXJiKzUmDwX9QuBGoZWzroekmANuCb0pPCLMMLu1jTghz8OJ0NYXMeBMj9YXC29bn9m311jP7kJW2Ez%2FPfF1dy%2Bi%2FMeaYyb0VQ0k3h5Rxozu3vP%2B5dx5GOJ%2FKQReeRWnUf%2B5DaGPkvn7orA76B%2FKTOny9RY95YxXFrLOrIMe2EZTTIw6siM6sSM%2FLnZsZG5rBPLqN2bRkM3oyazDHPZMuDYr3NiR7W5Y9jEurSxZViRc2mFrc7VuHXZntvLm3tzeTuyl6NRq9tcOJGN7ChO7ATmjBqh1akRK7LnLaMxhvMwvjW2E5s1w3nYv7udOhdNrRn53InaBNou7K4zbnXgcxfGTG4jJ2kvra6JreUNjNskZqe9AHsX1rIG47eXpe1GfW5%2BupLgu%2FIb4ihnzSjFg%2FYvvyhWrrjQ3AXUFbNcIaX8DsE%2FjHsBJoXcxQo79U%2BdQ8nr57AfpK4fxLHrzYp0GkPy92bDAWB52%2BiV1niwe831FYT9kTcZ7jZdSkz2sf3TjXGUlAgH4dYxlbLFYqomvOhce%2F0wrfk%2BZE4n8EeTNE6Hi18%2FGb%2FVngY4Dn2vWCX52uDYm038kTvLvV6801hJgVNsqoe1yxCw30bpJNBPMXRL85WMw1X1LZyEBaSWux48gZOYy6rATEisqbKn3H%2Fq9Zd%2BE8BL2QlxGFAirlP40TQQjT1IXHWlJ31XtT45G3hxHjx0VQUJqrfqrWFRFZqmC45AnGJNf2i1crdspUtcZYKXhjGuYfqCoE1n%2BQiMLOC6rE7BylAUCtK7AsigdG1Wz57XHwYwc5HNwHAvDrLi67dcefb1246aCZpZZdKuS1eO605mSU%2BJaii5sQf67snRzJt%2FNfdM7MnBfpgp2ToLXciSwU7XBCZiExuDMIMppx7gfu0CrCqzWKVXPishujMP1XpXLk299F7Ns4J2Fvw%2BUwq1nBaOpgXo1P4sW12MM03yPcZngRerjipVcj8Le8E%2B%2FS2FBgDbcORrd0j%2B0IfxZnmQVfo5qTwY%2Fj%2By05nHM09LgHgxHO8voKSFubrcJWz32F%2Fq8UnhxqnXD%2Fo7bdYZQZs2f%2BmyDt90lBbpTgs3x15F9wwyF2LAOWFSSp0gjT40g5WiGAFUONpj78N2Rz%2Fsu%2Bk02EEkaFVyjW9JgFfsczy9ojvCwqqUUV2KvcX1hRf3lUQ0CwYA9tEumxgVQtP32nQ0zjkHLrnOtcEs%2FpKGO5noptlfUDMJinmajU9eSkLl42HWcGJaWRtQ%2BaMh%2FojkHpPlQ3w5FpQ8z%2FLpj1OWXFAJRIXoj2k%2BfkWED6L5iRdOVqxmD0Kh%2FGl4u%2F7lJffw07ivVpysgDEKf7SzoKy4HRjcV1MDVd%2BXx%2BWmsbIujstKnu%2ByR6dsfw4PehvjQCUocf4XBdA%2BcPEqSDQh5VupH5iDalIyio6qfiB%2BkhMuIAmRjqi7Nc0u9bPF3JWK%2BaYamlixP3FiP5aoR4q4FyolUUctw6SgYEirY3Jr6egrxQDqxxhjM7qhoIIWpjGcm3S%2BMKMhKB%2BTKRUBimhhdYb3ZtSmLaOf2F2lgGrcItdjk0CbaBRb3Zt767IRgWpatDo3S%2BvyOjSN25G1HHOrcwuqyEdWtxFZl%2FW51QFldGkqu6eg1Ea9pJEHd9dTm1qD%2Fq9XIxtsVuoHPmPn04YaSurUvFRKChTU0kocpXK61siM%2Bgkoqhj%2BhjAfKn14zrfFlXyl%2BnkxWFdL4HS1Q78LrJJpfw2sL1PoquNq%2BjMCpIEzqm5eYCY1rn8I8J9ZgL9qw2i9dn2zdEqdvg6Nz1v7gNRduHwp8p6i%2FAOL3wuLB%2BgdXuVcl1sc5TC9owuNcK2U%2FRTUn%2FZKvfMCewWMLI9mL0NIMkkFCDRo9gJ5dhT6o1Up4tv3OF9Nf%2FYtLQQxSoSG9OOyH0AKXF%2FEKcKYcndzlh9BflirYzNraQMpMSHD60vr7jH5sbnTGUJmQmYvx3Oze4PtTj80gciYBLK0cx1bSXthL60I%2Fo1tYlKr40Sm0ZxDJcGQ%2FcRW5KdTh6rgjFQGty6b34P8PPXt06vJzwj0fKr2WhfJYP30gNrb29CBfpokwaSvzoBW%2FxZkCSF4r3pYPZ1CYIXgjAssHvagnjVl656RFw%2FTLCxGyVengix3H46%2BsXtQucgL%2FKOQBpQTTfBX%2BYd%2FuH8gsrWXXD8oA1AWQem8yj%2By7Z%2FarXQzbzJ%2B1r9XFX6tyiRQDXG0wg%2FsWpdclBtzmKoHpx5XfinfQEuIKpFcZ%2FhnEL5bmoRwXRMCwbKlCZ2QD1n8t5DFL9AjCtEaouJjK%2BcDs%2B8Cs%2FvByghUsoPASvaBdePxk%2BNhVehch%2FVYEPiCBIywMcsPgKrPAIZzuKRwTknsGgUJ%2FQiqFpDoxtjstplFmthOGqHT8e%2FtTmNkR6OxgoDVuQZJPeROtxG2jPHcAahanThRnxUdb3Vux3b3BjnGVWR2AeCdm%2B8A1R2%2BXfyYXUcB0lwAzfwJNOIGUcBVrHON6QgopA5Vln0oyJ9YQR6XJ3C12vKPPY8PxL4dYl8lKgGSsLSS4%2B0mIoAGI7S8QY8Zpk%2F3EzVMDng%2BT1fPkyB%2B%2FJc2wAd1KzyfppM8zSAFY68XxErkfw6y%2FKD3OfQqIUKQNzB6%2FThhmqkHqsrHC4P5NM3UNRkOD4SGXqVUbD1fduh2g0YkxuWDQAA89VbSqzbGvx1lxgEZ2ptAI1x7nrqjcDiK4bd4DhpHoT56lYNZVPsJWPoG9UFV9QCqDiuE2uAB1v7B4f8OHH4f59GrwBw0chDnYXs5j65qKxXiyKRHI5rOOdQqwojmbk3zHcHa%2F8p6LHXMuMGtzpibUXthTR6D9Ta0uzazI8VynLGdXIV2p4nUPgiwHdS6tACw1xGwHYBQY%2BR04XPHiR3DX9qJAqpJHWNIACwwd3PRMtrcSerfBKsDx31ykzcnt9jrtsHXq5G1PA%2FNxFZAXDqJuu%2FcgLma1Insewf%2B2pHPLaPGzNX9adZS96ujIbbAt1Zpsx0O7tCbsR5ZRYKgIy5t6gU5QAyQHqxID%2FtON1FlVTABMx%2BSXPzHJBfGnHDJOOLsfSTXPVTmBQAQaH8NP1kJLq9CVelNVdWXQ%2BokbSUxVHIxc9kGMI8XZqKSq87MLlT6y%2Fa93W1je3kFssOcW0lz6VzeLCDhIAmdEFYPkBW175ZcICXU5iMcv4EVq%2F3GyaVrkqMjSgoGDeQ6u7g4ZnI9T8HK%2F0%2BASibJz7BybXMwiBaVYLxAAutU%2F1jYfuaF7Rksqzdn1OszvsqDMqFyN1N3wrOnObnGsvjWywvr3usnnv97egIq8kvOrv7vBjf4vMqVPPgdoPbn%2FwGSB1Nz'; zlib.decompress(base64.decodestring(urllib.unquote(m)))"
Final result is:
{"app_id":"124024574287414","uid":"0","time":1483722700.043034,"app_ver":"10.3.0 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You can use gzuncompress in php :
https://secure.php.net/manual/fr/function.gzuncompress.php
<?php
$compressed = gzcompress('Compresse moi', 9); // or $compressed = "YOUrcOmpreSSedStRINg";
$uncompressed = gzuncompress($compressed);
echo $uncompressed;
?>

Is a batch operation to save a set of navigation properties possible?

For example: Company has Employees.
By posting to odata.svc/Company(1)/Employees/$ref, I can save Company-Employee relation. Can I save multiple Company-Employee links this way using odata.svc/Company(1)/Employees/$ref/$batch ?
I tried but didnt work. If this is incorrect way, is there any other alternative ?

OData does support batching, I'm not sure what version of OData you are using but here is some documentation from v3 (v4 is the same) http://www.odata.org/documentation/odata-version-3-0/batch-processing/
In your example batch URL, you are adding $batch to the end of the URL that you are using, instead you have to POST to odata.svc/$batch with a request that contains details of all of the operations that you want to perform. For example, here is one of the request taken from that link:
POST /service/$batch HTTP/1.1 Host: host Content-Type:
multipart/mixed; boundary=batch_36522ad7-fc75-4b56-8c71-56071383e77b
--batch_36522ad7-fc75-4b56-8c71-56071383e77b Content-Type: multipart/mixed;
boundary=changeset_77162fcd-b8da-41ac-a9f8-9357efbbd621
Content-Length: ###
--changeset_77162fcd-b8da-41ac-a9f8-9357efbbd621 Content-Type: application/http Content-Transfer-Encoding: binary Content-ID: 1
POST /service/Customers HTTP/1.1 Host: host Content-Type:
application/atom+xml;type=entry Content-Length: ###
--changeset_77162fcd-b8da-41ac-a9f8-9357efbbd621 Content-Type: application/http Content-Transfer-Encoding: binary
POST $1/Orders HTTP/1.1 Host: host Content-Type:
application/atom+xml;type=entry Content-Length: ###
--changeset_77162fcd-b8da-41ac-a9f8-9357efbbd621--
--batch_36522ad7-fc75-4b56-8c71-56071383e77b--

XMLHttpRequest Header : Decode Binary Data Upon Server Arrival

I am building a multipart/form-data httprequest, using Javascript's XMLHttpRequest object. Here are the headers:
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.5
Content-Length: 38539
Content-Type: multipart/form-data; charset=UTF-8; boundary=CONTENT_BOUNDARY
Cookie: __utma=111872281.167592067.1396133699.1396133699.1396133699.1; PHPSESSID=ea7cfjgi8e29v1bhnrj580vbc2
DNT: 1
Host: localhost:90
Referer: localhost:90/my_secret_referer/no_peeking.php
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0
I send the request to a PHP document.
In the following snippet one can observe a part of the request body. It details the transmission of binary data in base64 representing an image file that has been selected.
--CONTENT_BOUNDARY
Content-Disposition: form-data; name="images[]"; filename="airplane.jpg"
Content-Type: image/jpeg
Content-Transfer-Encoding: base64
.../9j/4AAQSkZJRgABAQEBLAEsAAD/2wBDABkRExYTEBkWFBYcGxkeJT4pJSIiJUw3Oi0...
This body part cooperates with the entire request to create a successful AJAX request to my server. When the information arrives at the server, I decode the information and do what I may with it.
The segment of this process that I am unsatisfied with is the manual decoding of the binary data. One is always able to receive uploaded images in the server as complete, legible image files when using jQuery's $.ajax() or Malsup's jQuery Form. I have looked into the format of the two mentioned requests and have found that they too send binary information using a multipart/form-data request. The one difference that I have found which I have not intentionally made is that my request is furnished with a
charset: utf8;
specification inside of the Content-Type after I send it.
Can I, and if I can, how can I tell the server to decode the binary information it receives?

YouTrack API Form Data Description

I am trying to send the description in form data to create an issue but it seems it is only possible through parameters with a length restriction. Does anybody know a way around this or am I doing something wrong?
PUT /rest/issue?project=LSDebug&summary=Debug%2520Log HTTP/1.1
Connection: keep-alive
Content-Length: 266
Accept: application/json, text/plain, */*
Origin: http://localhost:8080
Content-Type: application/x-www-form-urlencoded
Referer: http://localhost:8080/index.html
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-GB,en-US;q=0.8,en;q=0.6
Query String Parameters
project:LSDebug
summary:Debug%20Log
Form Data
description=Submitted%20Form%20name%3A%20null%2C%20Id%3Anull%0D%0AInput%20name%3A%20null%2C%20Id%3Anull%2C%20NgModel%3Aresult.homeTeamScore.score%2C%20Value%3A%201%0D%0AInput%20name%3A%20null%2C%20Id%3Anull%2C%20NgModel%3Aresult.awayTeamScore.score%2C%20Value%3A%202

I think you need to embed the data in XML within the body of your PUT request as documented in the Import REST API docs.

Html forms only support GET or POST. So i would suggest you to post the form data using POST method instead of PUT. So that the form content will go into the body of the message and you will able to evade the URL restriction

multipart/mixed HTTP request in actionscript

Is there an easy way to make an multipart/mixed HTTP request in as3?
I'm trying to reach LightSwitch server using OData protocol from flash. To send multiple commands at once you can combine them in one batch using HTTP request with "multipart/mixed" content type.
Here an example of HTTP requests with two commands:
Content-Type:multipart/mixed; boundary=batch
--batch
Content-Type: multipart/mixed; boundary=changeset
--changeset
Content-Type: application/http
Content-Transfer-Encoding: binary
PUT http://localhost:18065/ApplicationData.svc/Orders(3)/$links/User HTTP/1.1
Content-Type: application/json;odata=verbose
{"uri": "http://localhost:18065/ApplicationData.svc/Users(4)"}
--changeset
Content-Type: application/http
Content-Transfer-Encoding: binary
MERGE http://localhost:18065/ApplicationData.svc/Users(3) HTTP/1.1
Content-Type: application/json;odata=verbose
If-Match: W/"X'0000000000002715'"
{"Name": "User 3_"}
--changeset--
--batch--
Every part contains own HTTP headers and body. Response formatted the same way, with own http response code.
How to work with multiple HTTP requests in actionscript?